National Diet

National Diet of Japan

国会

Kokkai
217th Session of the National Diet
Type
Type
Houses
History
Founded29 November 1890
(134 years, 294 days)
Leadership
President of the House of Councillors
Masakazu Sekiguchi, LDP
since 11 November 2024
Speaker of the House of Representatives
Fukushiro Nukaga, LDP
since 11 November 2024
Shigeru Ishiba, LDP
since 1 October 2024
Structure
Seats
House of Councillors political groups
Government (121)
  •   LDP (100)
  •   Kōmeitō (21)

Opposition (118)

  •   CDP-SDP (43)[a]
  •   DPFP (25)[b]
  •   Ishin (19)
  •   Sanseitō (15)
  •   JCP (7)
  •   Reiwa (6)
  •   CPJ (2)
  •   Okinawa Whirlwind (2)

Unaffiliated (9)

House of Representatives political groups
Government (220)
  •   LDP (196)[d]
  •   Kōmeitō (24)

Opposition (240)

  •   CDP (148)[e]
  •   Ishin (38)
  •   DPFP (27)
  •   Reiwa (9)
  •   JCP (8)
  •   Yūshi no Kai (4)[f]
  •   Sanseitō (3)
  •   CPJ (3)

Unaffiliated (5)

  •   LDP (1/Speaker)
  •   CDP (1/Vice Speaker)
  •   Independent (3)
Elections
Parallel voting:
Single non-transferable vote (147 seats)
Party-list proportional representation (98 seats)
Staggered elections
House of Representatives voting system
Parallel voting:
First-past-the-post voting (289 seats)
Party-list proportional representation (176 seats)
Last House of Councillors election
20 July 2025
Last House of Representatives election
27 October 2024
Next House of Councillors election
2028
Next House of Representatives election
No later than 22 October 2028
Meeting place
National Diet Building,
Nagatachō 1-7-1, Chiyoda District, Tokyo, Japan
35°40′33″N 139°44′42″E / 35.67583°N 139.74500°E / 35.67583; 139.74500
Website

The National Diet (国会, Kokkai; Japanese pronunciation: [kok̚.kai][1]) is the national legislature of Japan. It is composed of a lower house, called the House of Representatives (衆議院, Shūgiin), and an upper house, the House of Councillors (参議院, Sangiin). Both houses are directly elected under a parallel voting system. In addition to passing laws, the Diet is formally responsible for nominating the prime minister. The Diet was first established as the Imperial Diet in 1890 under the Meiji Constitution, and took its current form in 1947 upon the adoption of the post-war constitution. Both houses meet in the National Diet Building (国会議事堂, Kokkai-gijidō) in Nagatachō, Chiyoda, Tokyo.


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  1. ^ NHK Broadcasting Culture Research Institute, ed. (May 24, 2016). NHK日本語発音アクセント新辞典 (in Japanese). NHK Publishing.