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Gemini Group · Visual explainer

How Japan governs

The Diet, the Cabinet, the ministries, and the road a bill travels between them. A field guide, in one scroll.

Sovereignty · 主権在民

Power starts at the ballot box. Sovereignty rests with the people, and only one part of the national government is elected directly by them: the National Diet.

The National Diet · 国会

Two chambers, and the only body in Japan that can make law. The House of Representatives: 465 seats, four-year terms, dissolvable at any moment. The House of Councillors: 248 seats, six-year terms, never dissolved, half refreshed every three years.

The Prime Minister · 内閣総理大臣

The Diet designates the Prime Minister from among its own members. When the two chambers disagree on the choice, the Lower House prevails. Command a majority there and you command the government.

The Cabinet · 内閣

The PM appoints the Cabinet, and a majority of its ministers must sit in the Diet. Executive power is collective: the Cabinet answers to the Diet as one body, and a single no-confidence vote can bring it down.

The ministries · 中央省庁

One office, eleven ministries, and a constellation of agencies employ the career officials who write most of what becomes law. Policy is born here, in expert panels called shingikai (審議会), long before it is voted on anywhere.

How a bill becomes law

Most enacted laws begin as Cabinet bills: drafted in a ministry, stress-tested by the Cabinet Legislation Bureau, adopted at a Cabinet meeting, then examined twice in each chamber, committee first, plenary second.

When the chambers split

If the Councillors reject a bill, the Representatives can override with a two-thirds vote. For budgets, treaties, and choosing the PM, the Lower House simply prevails after a waiting period. Money never waits.

The full circuit

Voters make the Diet. The Diet makes the Prime Minister. The PM makes the Cabinet. The Cabinet steers the ministries. The ministries write the laws that come back to govern the voters.

Ministry engagement guide Talk to us

About this piece

This is the structural map of the Japanese state: the two houses of the National Diet, the Prime Minister the Diet designates, the Cabinet the PM appoints, and the ministries where the overwhelming majority of legislation is actually drafted. Historically, 80 to 90 percent of laws enacted in a given Diet session originate as Cabinet bills rather than lawmaker-sponsored bills, which is why understanding the ministries and their advisory councils matters more to most policy outcomes than following floor votes.

Those councils are worth naming, because they are where the substance is usually settled. A shingikai (審議会) is an advisory council convened by a ministry: a standing or ad hoc panel of academics, industry representatives, labour and consumer bodies and other outside experts, asked to deliberate a question and produce a report. The ministry is not formally bound by what a shingikai recommends, but in practice its reports become the outline of the bill that follows. The rhythm is annual rather than fixed: interim reports (中間とりまとめ) commonly appear mid-year and final reports in winter, feeding bills into the ordinary Diet session that convenes each January. Agendas, minutes and submitted materials are published, which makes the shingikai the earliest public signal of where a policy is heading, and the point at which argument is still genuinely capable of changing the outcome. By the time the same policy reaches a Diet committee, the decisions that matter have usually already been taken.

The figures shown are statutory and current as of publication: 465 seats in the House of Representatives, 248 in the House of Councillors, and the one-office, eleven-ministry structure of the central government. For a practical guide to working with the bureaucracy, see our ministry engagement guide. For how the Diet's electoral mechanics work, see our explainer on Japan's proportional representation system, and for the fuller policymaking pipeline, how Japanese policymaking works.

If your organization needs all of this turned into an engagement strategy, from identifying the right bureau to timing the shingikai calendar, get in touch.