How Is Japan's Prime Minister Chosen? The Mechanism for Nominating the Prime Minister and the Future of the Administration

The Process for Selecting the Prime Minister

Japan operates under a parliamentary system. The Prime Minister is not elected directly by the people; rather, the Diet appoints the Prime Minister from among the members of the Diet elected by the people.

Appointment by the National Diet

The Constitution of Japan stipulates the following regarding the Prime Minister. (Source: House of Representatives, “Constitution of Japan”)

• The Prime Minister is appointed from among the members of the Diet by a resolution of the Diet. This appointment takes precedence over all other matters.
• The Emperor appoints the Prime Minister based on a nomination by the Diet.
• The Prime Minister and all other ministers must be civilians.
• The Prime Minister appoints ministers. However, a majority of the ministers must be members of the Diet.
• The Cabinet bears collective responsibility to the Diet for the exercise of executive power.

When the nominations from the House of Representatives and the House of Councillors differ

The House of Representatives and the House of Councillors each pass a separate resolution to nominate the Prime Minister. If the two chambers nominate different individuals and fail to reach agreement even after holding a joint conference, the resolution of the House of Representatives shall be deemed the resolution of the Diet. The same applies if the House of Representatives makes a nomination and the House of Councillors fails to pass a resolution within 10 days, excluding periods of recess. (Source: House of Representatives, “Constitution of Japan”)

For this reason, it is the majority in the House of Representatives that actually determines who becomes prime minister (as summarized in this article). Even the leader of a political party that does not hold a majority in the House of Councillors can become prime minister if they secure majority support in the House of Representatives.

The Moment the Prime Minister Steps Down

Under the provisions of the Constitution, a change in the Prime Minister typically occurs in the following situations. (Source: House of Representatives, “Constitution of Japan”)

1. When the Diet is convened for the first time following a general election for members of the House of Representatives, the Cabinet resigns en masse, and the Diet appoints a new prime minister.
2. When the House of Representatives passes a motion of no confidence in the Cabinet, the Cabinet must resign en masse unless the House of Representatives is dissolved within 10 days.
3. When the Prime Minister is absent, the Cabinet resigns en masse.

In any scenario, the new prime minister is appointed by the Diet. Here is a summary of this article. If a political party holding a majority in the House of Representatives changes its party leader, and the incumbent prime minister resigns and the cabinet resigns en masse, the Diet will appoint a new prime minister. If that party nominates its new leader as prime minister, that person becomes prime minister by resolution of the House of Representatives. For this reason, the election to choose the leader of the party holding a majority in the House of Representatives can be considered, in effect, the process for selecting the next prime minister.

The Terms of Office of the Two Chambers and the Enactment of Laws

The term of office for members of the House of Representatives is four years. However, if the House of Representatives is dissolved, their term ends prematurely.A general election must be held within 40 days of the date of dissolution, and the Diet must be convened within 30 days of the election date. The dissolution of the House of Representatives is an act of state performed by the Emperor upon the advice and with the consent of the Cabinet. (Source: House of Representatives, “Constitution of Japan”)

The term of office for members of the House of Councillors is six years, and half of the members are elected every three years. (Source: House of Representatives, “Constitution of Japan”)

A bill becomes law when it is passed by both chambers of the Diet. Even if the House of Councillors votes differently from the House of Representatives on a bill, it becomes law if the House of Representatives passes it again by a vote of two-thirds or more of the members present. If the House of Councillors fails to take a vote on a bill passed by the House of Representatives within 60 days of receiving it—excluding periods of recess—the House of Representatives may deem the bill to have been rejected by the House of Councillors. (Source: House of Representatives, “Constitution of Japan”)

Schedule until the next milestone

List the key dates in chronological order. The date of the Liberal Democratic Party leadership election next fall has not yet been announced.

(Source: Liberal Democratic Party, “Agreement Reached on Coalition with Ishin”; Prime Minister’s Office, “Prime Minister Takachiho’s Press Conference (September 17, 2026)”“Press Conference on the Replacement of the Minister of Agriculture, Forestry and Fisheries,” Announcement of the Publication of the Liberal Democratic Party’s Official Newspaper “Jiyu Minshu,” NHK “Min-kai Leader Ogawa: ‘Reunite Former Democratic Forces and Work with Komeito (公明党) to Bring About a Change in Government’”—List of Related Articles, House of Councillors “List of Members by Parliamentary Group”)

The reference to the party leadership election scheduled for next fall comes from a question posed by a reporter at a press conference on September 17, who stated, “The party leadership election scheduled for next fall.” Prime Minister Takaichi responded that the Cabinet reshuffle announced that day was unrelated to next year’s party leadership election. (Source: Prime Minister’s Office, “Press Conference by Prime Minister Takaichi (September 17, 2026)”)

Since the term of office for members of the House of Representatives is four years, barring a dissolution of the House, their terms will continue until four years after the general election in February 2026. This is based on the calculations in this article.

Current Situation: The Composition of the National Diet and the Issues Currently Being Debated

Composition of Parliamentary Groups in the House of Representatives and the House of Councillors

The composition of parliamentary groups in the House of Representatives (as of September 28, 2026) is as follows. (Source: House of Representatives, “Names of Parliamentary Groups and Number of Members by Group”)

The composition of parliamentary groups in the House of Councillors (as of October 13, 2026) is as follows. (Source: House of Councillors, “List of Members by Parliamentary Group”)

According to the calculations in this article, in the House of Representatives, the Liberal Democratic Party caucus alone accounts for more than two-thirds of the total seats. In the House of Councillors, however, even when the Liberal Democratic Party and Japan Innovation Party caucuses are combined, they do not reach a majority of the total seats. At a press conference on September 17, a reporter also asked a question by stating, “In the House of Councillors, the ruling party is in the minority.”(Sources: House of Representatives, “Names of Parliamentary Groups and Number of Members by Group”; House of Councillors, “List of Members by Parliamentary Group”; Prime Minister’s Office, “Press Conference by Prime Minister Takashi Takagi (September 17, 2026)”)

The government side

At a press conference on September 17, Prime Minister Takaichi stated that in the February general election for the House of Representatives, the Liberal Democratic Party won 316 seats and the Japan Innovation Party won 36 seats. At the same press conference, she announced that Nakatsuka Hiroshi (中司宏), who had served as Secretary-General of the Japan Innovation Party, would join the cabinet as Minister in Charge of Regulatory Reform. Prime Minister Takaichi characterized Mr. Nakatsuka’s appointment as a symbol of the coalition government between the Liberal Democratic Party and the Japan Innovation Party entering a new phase. (Source: Prime Minister’s Office, “Press Conference by Prime Minister Takaichi (September 17, 2026)”)

In her policy address on October 5, Prime Minister Takaichi advocated for “responsible expansionary fiscal policy.”She noted that the inflation rate is the lowest among G7 nations and that real wage growth has been positive for eight consecutive months. She added that preparations are underway for the “Consumption Tax and Support Payments Bill,” which would reduce the consumption tax on food and beverages and establish income-based support payments. Prime Minister Takaichi noted that calls for a consumption tax cut had been widely echoed by the opposition parties and called for their cooperation on the bill. She stated that the necessary funding would be secured without relying on special-purpose bonds. (Source: Prime Minister’s Office, “Prime Minister Takaichi’s Policy Address at the 222nd Session of the Diet”)

At the press conference on September 17, a reporter asked a question regarding the proposal to lower the consumption tax rate on food and beverages to 1% for two years starting next year. At the same press conference, the reporter also touched on the persistently high long-term interest rates in Japan. (Source: Prime Minister’s Office, “Press Conference by Prime Minister Takachi (September 17, 2026)”)

It has been reported that Yoshimura Hirofumi (吉村洋文), leader of the Japan Innovation Party, stated on September 26 during the extraordinary session of the Diet that he is determined to achieve a reduction in the number of seats in the House of Representatives and a consumption tax cut on food products. Under the coalition agreement reached in October 2025, the parties aimed to pass a member-initiated bill to reduce the number of seats in the House of Representatives, with a “target of 10 percent.” The bill to reduce the number of seats was submitted by the Liberal Democratic Party and the Japan Innovation Party and, as of September 17, was under continued deliberation. (Sources: NHK, “Japan Innovation Party Leader Yoshimura: ‘We Will Definitely Achieve Seats Reduction and Consumption Tax Cut in the Extraordinary Diet Session’”; Liberal Democratic Party, “Agreement Reached on Coalition with Japan Innovation Party”; Prime Minister’s Office, “Prime Minister Takashi’s Press Conference (September 17, 2026)”)

The opposition side

At a press conference on October 13, Tamaki Yuichiro (玉木雄一郎), leader of the Democratic Party For the People, stated that he does not oppose measures to reduce the tax burden or tax cuts. However, he pointed out that he has absolutely no understanding of the details regarding the support payments set to be introduced in April 2029 to replace the consumption tax cut. Mr. Tamaki argued that this bill amounts to a tax increase on the middle class two years from now and made it clear that he cannot approve it as it stands. (Source: Democratic Party For the People, “Democratic Party For the People: Leader’s Regular Press Conference (October 13, 2026)”)

"The Center," the largest opposition caucus in the House of Representatives, is a unified caucus that the Centrist Reform Alliance (中道改革連合) had aimed to form during the process of realignment. On September 2, the Centrist Reform Alliance announced that it had failed to achieve a merger in which the three parties would become one. On September 16, Leader Ogawa Junya (小川淳也) resigned, and House of Representatives member Watanabe So (渡辺創) was elected as the new leader. On the same day, the resignation of 48 Diet members from the coalition was approved. The Centrist Reform Alliance plans to merge into a new party after completing the reorganization of its structure and finances. (Sources: Centrist Reform Alliance official website, “On the Restart of the Centrist Reform Alliance” and “Watanabe So Elected as New Leader at General Assembly of Legislators”; House of Representatives, “Names of Parliamentary Groups and Number of Members by Group”)

It has been reported that Ogawa, the leader of the Democratic Reform Association (民主改革の会)—a group formed by former members of the Constitutional Democratic Party of Japan (立憲民主党)—stated on October 9 that he aims to reunite the forces of the former Democratic Party of Japan, including the Democratic Party For the People and the Constitutional Democratic Party of Japan, and work in cooperation with the Komeito Party to bring about a change in government. (Source: NHK, “Democratic Reform Association Leader Ogawa: ‘Reunite Former Democratic Party Forces and Collaborate with Komeito to Achieve a Change in Government’”)

Cabinet Ministers' Resignations and Public Opinion Polls

On October 14, Minister of Agriculture, Forestry and Fisheries Yana Kazuo submitted his resignation. It has been reported that a series of issues had been raised regarding Mr. Yana, including remarks he made concerning the budget for roads in his constituency. Prime Minister Takaichi accepted Mr. Yana’s resignation and stated that she takes her responsibility for his appointment very seriously. Prime Minister Takaichi said she would announce the successor on October 15. (Source: Prime Minister’s Office, “Press Conference on the Replacement of the Minister of Agriculture, Forestry and Fisheries”; NHK, “[Details] Agriculture Minister Yana Submits Resignation Amid Criticism Over Remarks on Road Budgets and Other Issues”)

At a press conference on October 13, Tamaki, the leader of the Democratic Party For the People, referred to the censure resolution reportedly under consideration in the House of Councillors and stated that he would assess how Mr. Yana handled his explanation. Additionally, according to the headline of an NHK article, Minister of Education, Culture, Sports, Science and Technology Seki Yoshihiro (関芳弘) admitted to holding a political fundraising party inside the Diet Members’ Office Building—a prohibited act—and apologized. (Source: Democratic Party For the People, “Democratic Party For the People: Leader’s Regular Press Conference (October 13, 2026)”; NHK, “[Details] Agriculture Minister Yana Submits Resignation Amid Criticism Over Road Budget Remarks and Other Issues”—list of related articles)

According to a public opinion poll released by NHK on October 13, the percentage of people who said they “support” the Takagi Cabinet fell by 2 percentage points from the September poll to 51 percent. The percentage of those who said they “do not support” it rose by 1 percentage point to 32 percent. According to the headline of the NHK article, the party approval ratings from the same survey showed the Liberal Democratic Party (LDP) at 35.3% and “no preference” at 38.5%. (Source: NHK, “Takahashi Cabinet Approval Rating at 51%, Disapproval at 32%: NHK Opinion Poll”)

Developments in the Countries Involved and the Global Situation

In her policy address, Prime Minister Takaichi identified the Japan-U.S. alliance as the cornerstone of Japan’s foreign policy and national security. At the beginning of her speech, she referred to the arrest of a U.S. Marine in connection with a robbery-murder case in Okinawa Prefecture and stated that she had lodged a strong protest with the U.S. side. (Source: Office of the Prime Minister, “Prime Minister Takaichi’s Policy Address at the 222nd Session of the Diet”)

Regarding the Japan-U.S. summit in September, Prime Minister Takaichi explained that the U.S. side had raised concerns that the weak yen was making trade conditions difficult for the United States, and she stated that, as a general principle, the undervaluation of the yen is a problem. Regarding the International Criminal Court, she acknowledged that the U.S. harbors significant distrust but noted that Japan continues to engage with the U.S. on the matter. (Source: Prime Minister’s Office, “Press Conference on the Japan-U.S. Summit and Other Matters,” “Press Conference by Prime Minister Takaichi (September 17, 2026)”)

Regarding China, Prime Minister Takaichi stated that it is an important neighbor and that Japan will comprehensively advance a “strategic mutually beneficial relationship.” At the same time, she stated that Japan will make its position clear on issues such as those in the East China Sea and the South China Sea, as well as military activities and intimidating measures in Japan’s surrounding areas. Regarding a meeting with President Xi Jinping (习近平) scheduled to coincide with the Asia-Pacific Economic Cooperation (APEC) Leaders’ Meeting in November, she said she would refrain from making any premature judgments. (Source: Prime Minister’s Office, “Prime Minister Takaichi’s Policy Address to the 222nd Session of the Diet” and “Prime Minister Takaichi’s Press Conference (September 17, 2026)”)

In addition, the speech cited the tense situation in the Middle East as one of the reasons for promoting crisis management investments, stating that the goal is to reduce dependence on specific supply routes for crude oil and other commodities and to diversify sources of supply. To fundamentally strengthen defense capabilities, the speech stated that the “Three Documents” will be reviewed by the end of the year. (Source: Prime Minister’s Office, “Prime Minister Takachi’s Policy Address at the 222nd Session of the Diet”)

Future Developments and Scenario Analysis

What follows is not a statement of fact, but rather an analysis based on the facts presented so far. This article does not offer any predictions regarding the outcome. Nor does it indicate which outcome would be preferable.

The Place Where the Prime Minister Is Chosen

Based on the facts presented so far, the following can be said: In the House of Representatives, the Liberal Democratic Party caucus alone holds more than two-thirds of the seats. Consequently, until the next general election, the Liberal Democratic Party will, in effect, be the party that designates the prime minister. In terms of the number of seats, even if the Japan Innovation Party were to leave the coalition, the process for designating the prime minister in the House of Representatives would remain unchanged, as the Liberal Democratic Party caucus alone would still reach the two-thirds majority required for re-approval. If there were to be a change in the prime minister, it is likely that the LDP presidential election would serve as the occasion for that change.

On the other hand, in the House of Councillors, the Liberal Democratic Party caucus has 101 members, and even when combined with the 19 members of the Japan Innovation Party, they do not have a majority.A coalition with the Japan Innovation Party is primarily effective in the House of Councillors. To pass a bill, it is necessary to secure the support of other caucuses in the House of Councillors or to have it passed again in the House of Representatives with a two-thirds majority.

Four Factors That Make the Difference

The future of the administration depends on the assumptions made regarding the following four points.

1. Cooperation in the House of Councillors: The key question is whether the Democratic Party For the People (25 members in the House of Councillors) and the Komeito Party (21 members in the House of Councillors) will vote in favor of the consumption tax and financial aid bills. The Democratic Party For the People has stated that it cannot approve the bills unless the details of the financial aid are disclosed. This article has not confirmed the Komeito Party’s position on these bills.
2. Support for the Cabinet: The question is how the current 51% approval rating will change in light of cabinet ministers’ resignations and other developments. In terms of party support, the 38.5% who “do not support any party” outnumber the 35.3% who support the Liberal Democratic Party.
3. Coalition Cohesion: The question is whether the reduction in the number of seats sought by the Japan Innovation Party will move forward in the current Diet session. A bill to reduce the number of seats must also pass the House of Councillors. If the Japan Innovation Party leaves the coalition, the ruling bloc in the House of Councillors will consist solely of the Liberal Democratic Party’s 101 members.
4. Opposition Realignment: The question is how the lawmakers who have left the Centrist Reform Alliance will regroup. The Democratic Reform Association has stated that it aims to form a coalition with the Komeito Party.

The following three scenarios are based on different assumptions regarding these four points.

Scenario 1: The current coalition continues under Prime Minister Takaichi

Assumption

Regarding cooperation in the House of Councillors, we assume that the government will outline the details of the financial aid sought by the Democratic Party For the People, and that the Democratic Party For the People will either support the measure or, at the very least, not vote against it. We assume that support for the Cabinet will remain at a level close to the current 51%.Current approval stands at 51%, down 2 percentage points from September. Regarding coalition unity, we assume that the Liberal Democratic Party (LDP) and the Japan Innovation Party will reach an agreement on the reduction in the number of seats—including the timing of its enactment—and that the Japan Innovation Party will remain in the coalition. We assume that the realignment of the opposition parties will not be finalized by next fall.

Being Guided

If the Japan Innovation Party remains in the coalition and the 25 members of the Democratic Party For the People in the House of Councillors join, the combined caucuses of the two parties will exceed a majority of the total 248 seats (according to the calculations in this article). As a result, the bill will be enacted without requiring re-approval by the House of Representatives. The administration will be able to cite the passage of the bill as an achievement. If support remains steady and the opposition fails to unite, the case for replacing the Liberal Democratic Party president will weaken. Prime Minister Takaichi will find it easier to seek reelection in the party leadership election next fall and is expected to continue as prime minister following a vote of confidence in the Diet. On the diplomatic front, since the same prime minister will attend the summit in November, dialogue with the United States and China is expected to proceed as an extension of the current policy.

If the assumption is proven wrong

The most difficult assumption to fulfill is the cooperation of the Democratic Party For the People. If the eligibility criteria and amount of the financial aid are not finalized by the end of the year, the Democratic Party For the People will find it difficult to support the measure, bringing us closer to Scenario 2. If support continues to decline due to ongoing issues involving cabinet ministers, we will move closer to Scenario 3.

The Outlook Ahead

The election for members of the House of Councillors, whose terms expire in July 2028, will be the next major milestone. Whether or not two parties secure a majority in the House of Councillors in this election will likely determine whether the current situation—in which cooperation from other parties is required for each bill—will continue.

Scenario 2: The government’s framework expands to secure the cooperation of the House of Councillors

Assumption

Regarding cooperation in the House of Councillors, we assume that neither the Democratic Party For the People nor the Komeito will support this bill, citing reasons such as the lack of details on the relief payments. We assume that support for the Cabinet will remain at a level close to the current 51 percent. We assume that the coalition will remain united. We assume that no realignment among the opposition parties will occur, and that the government will subsequently establish a forum to discuss the design of the relief payments with the Democratic Party For the People, leading the Democratic Party For the People to choose ongoing cooperation with the administration in order to participate in those discussions. Mr. Tamaki is merely pointing out that the details of the relief payments are unknown; this assumption cannot be directly derived from his remarks.

Being Guided

Even if a bill is rejected by the House of Councillors, it will become law if it is passed again by a two-thirds majority in the House of Representatives. However, unless the House of Councillors expedites its vote, it will be necessary to wait 60 days before the bill is deemed rejected, and there is a possibility that it will not be passed again in time before the end of the session on December 12 (according to this article’s calculations). Since each bill faces these scheduling constraints, the administration is expected to seek cooperation outside the cabinet or expand its coalition with parties such as the Democratic Party For the People in order to secure a stable majority in the House of Councillors. If the Democratic Party For the People joins the coalition, its proposals are likely to be incorporated into the design of the financial aid program. Even if Ms. Takaichi remains Prime Minister, the policy-making process will shift to one determined by consensus among the three parties. Since the relative influence of the Japan Innovation Party’s 19 members in the House of Councillors will diminish, the party is expected to continue strongly demanding the reduction of the number of seats as a condition for remaining in the coalition.

If the assumption is proven wrong

The most difficult assumption to fulfill is that the Democratic Party For the People will choose to cooperate with the administration on a permanent basis. If the Democratic Party For the People chooses to join the opposition realignment, the deadlock in the House of Councillors will continue, and the situation will move closer to Scenario 3 as support declines.

The Outlook Ahead

In next fall’s presidential election, whether to continue the new framework for cooperation is expected to be one of the key issues. In the 2028 House of Councillors election, whether the cooperating parties will coordinate their candidate selections is expected to be a key focus.

Scenario 3: Support continues to decline, and the prime minister is replaced

Assumption

Regarding support for the Cabinet, we assume that support will continue to decline as issues such as ministerial resignations persist. According to the latest figures, the percentage of those who “do not support” the Cabinet has risen by 1 percentage point since September to 32%.Regarding cooperation in the House of Councillors, we assume that the opposition parties will intensify their confrontational stance on bills and censure resolutions, and that the House of Councillors will not rush to pass legislation. In this scenario, it would be necessary to wait 60 days before a bill is deemed rejected, and we assume that the bill will not be enacted in time for the end of the session on December 12. Regarding coalition cohesion, we assume that the reduction in the number of seats will be postponed, leading to growing dissatisfaction within the Japan Innovation Party. Regarding opposition realignment, we assume that the Democratic Reform Association will move forward with cooperation with the Democratic Party For the People and the Komeito.

Being Guided

If support declines, it is likely that calls for a change in the Liberal Democratic Party’s leadership will grow stronger among LDP lawmakers ahead of the 2028 House of Councillors election. In next fall’s party leadership election, a new president will be elected if Prime Minister Takaichi is not re-elected or does not run for re-election. If Prime Minister Takaichi resigns and the Cabinet resigns en masse, the Diet will nominate a new prime minister. Since the Liberal Democratic Party caucus alone holds more than two-thirds of the seats in the House of Representatives, even if the Japan Innovation Party leaves the coalition, the new party president will become prime minister through the Diet’s nomination. Even if a different person is nominated in the House of Councillors, the vote in the House of Representatives will constitute the decision of the Diet. The new prime minister will have to decide anew whether to uphold the coalition agreement with the Japan Innovation Party, particularly regarding the reduction in the number of seats. In foreign policy, a change in prime minister is likely to necessitate rebuilding summit-level relations with the United States and China.

If the assumption is proven wrong

The most difficult assumption to fulfill is that approval ratings will continue to decline. If the issue is resolved—for example, through the appointment of a new Minister of Agriculture, Forestry and Fisheries—and approval ratings return to their current level, the situation will move closer to Scenario 1.

The Outlook Ahead

For the opposition to take power, it must secure a majority in the House of Representatives, which means it will have to wait for the next general election. In the meantime, the opposition’s realignment is likely to focus on the immediate goal of ensuring that the Liberal Democratic Party-led coalition remains in the minority in the House of Councillors in the 2028 House of Councillors election.

Comparison of the Three Scenarios

Presenting Options

The following is an analysis, not a statement of fact. It does not indicate which option is preferable. With neither of the two party caucuses in the House of Councillors holding a majority, the administration and the various parties are faced with the decision of how to structure the government. (Source: House of Councillors “List of Members by Caucus”)

In addition, although this article does not address it, the Cabinet could dissolve the House of Representatives and seek the people’s judgment again through a general election—this is also a constitutional option.

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This article was written by AI from public records and non-governmental sources, and translated automatically.

• House of Councillors
• Liberal Democratic Party Presidential Election
• Nomination of the Prime Minister
• The Takagi Cabinet