National Diet
Japan's bicameral legislature, supreme law-making organ of the state.
The National Diet is the national legislature of Japan, established in 1890 as the Imperial Diet under the Meiji Constitution and reorganized in 1947 under the post-war constitution. It is composed of a lower house, the House of Representatives, and an upper house, the House of Councillors, both directly elected under a parallel voting system. The Diet is formally responsible for nominating the prime minister and is described in Article 41 of the Constitution as 'the highest organ of State power' and 'the sole law-making organ of the State.'
- Established
- 1890 (as Imperial Diet); 1947 (current form)
- Type
- Bicameral legislature
- Lower House
- House of Representatives
- Upper House
- House of Councillors
- Voting System
- Parallel voting (mixed-member majoritarian)
- Meeting Place
- National Diet Building, Nagatachō, Chiyoda, Tokyo
- Constitutional Basis
- Article 41 of the Constitution of Japan
Lore & Background
The House of Representatives is the more powerful chamber. It can overrule the House of Councillors on bills if two-thirds of members present agree, and it alone determines the prime minister's continuation in office through confidence. The Diet's responsibilities include making laws, approving the annual national budget, ratifying treaties, and initiating constitutional amendments. The Supreme Court began exercising judicial review of apportionment laws following the Kurokawa decision of 1976, invalidating an election where one district had five times the representation of another.
Reader's Guide
The National Diet is central to Japan's post-war democratic system, embodying legislative supremacy over the executive. Its bicameral structure, with the House of Representatives holding greater power, ensures checks on the upper house while maintaining stability. The parallel voting system, distinct from mixed-member proportional systems, shapes electoral outcomes and has been a source of contention over malapportionment, particularly favoring rural areas historically aligned with the Liberal Democratic Party. The Diet's ability to conduct investigations, impeach judges, and compel cabinet appearances reinforces its oversight role. Its legislative process, dominated by cabinet-submitted bills, reflects a balance between executive initiative and parliamentary deliberation. The Diet's evolution from the Imperial Diet to its current form marks Japan's transition from imperial sovereignty to popular sovereignty, with the Emperor's role reduced to a formal promulgation of laws. Ongoing debates over reapportionment and electoral fairness continue to define its political landscape.
Did You Know?
- The Diet was first established as the Imperial Diet in 1890 under the Meiji Constitution.
- Voters cast two votes: one for an individual candidate and one for a party list.
- The House of Representatives can overrule the House of Councillors on a bill if two-thirds of members present agree.
- The Supreme Court began judicial review of apportionment laws after the Kurokawa decision of 1976.
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