Politics of Japan are conducted in a framework of a dominant-party bicameral parliamentary constitutional monarchy, in which the Emperor is the head of state and the Prime Minister is the head of government and the head of the Cabinet, which directs the executive branch.
The National Diet is the national legislature of Japan. It is composed of a lower house, called the House of Representatives, and an upper house, the House of Councillors. 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 in Nagatachō, Chiyoda, Tokyo.
Tetsu Katayama was a Japanese politician who was Prime Minister of Japan from 1947 to 1948. A Christian pacifist, he bears the distinction of having been the first socialist to serve as Prime Minister of Japan. He was a Christian socialist.
Hitoshi Ashida was a Japanese politician who served as Prime Minister of Japan in 1948. He was a prominent figure in the immediate postwar political landscape, but was forced to resign his leadership responsibilities after a corruption scandal targeting two of his cabinet ministers.
Ichirō Hatoyama was a Japanese politician who served as Prime Minister of Japan from 1954 to 1956. During his tenure he oversaw the formation of the Liberal Democratic Party and restored official relations with the Soviet Union.
The House of Representatives is the lower house of the National Diet of Japan. The House of Councillors is the upper house. The composition of the House is established by Article 41 and Article 42 of the Constitution of Japan. The House of Representatives has 465 members, elected for a four-year term. Of these, 176 members are elected from 11 multi-member constituencies by a party-list system of proportional representation, and 289 are elected from single-member constituencies.
The House of Councillors is the upper house of the National Diet of Japan. The House of Representatives is the lower house. The House of Councillors is the successor to the pre-war House of Peers. If the two houses disagree on matters of the budget, treaties, or the nomination of the prime minister, the House of Representatives can insist on its decision. In other decisions, the House of Representatives can override a vote of the House of Councillors only by a two-thirds majority of members present.
General elections were held in Japan on November 9, 2003. Incumbent Prime Minister Junichiro Koizumi of the Liberal Democrat Party won the election but with a reduced majority. The main opposition Democratic Party made considerable gains, winning 177 of the 480 seats in the House of Representatives, its largest share ever. Other traditional parties like the Communist Party and the Social Democrat Party lost a significant numbers of seats, marking the start of a new two-party system in Japanese politics, which would end in 2012 with the emergence of Japan Restoration Party.
The Social Democratic Party is a political party in Japan that was established in 1996. Since its reformation and name change in 1996, it has advocated pacifism and defined itself as a social-democratic party. It was previously known as the Japan Socialist Party.
The Japan Socialist Party was a socialist and progressive political party in Japan that existed from 1945 to 1996. The party was founded as the Social Democratic Party of Japan by members of several proletarian parties that existed before World War II, including the Social Mass Party, the Labour-Farmer Party, and the Japan Labour-Farmer Party. The party represented the Japanese left after the war, and was a major opponent of the right-wing Liberal Democratic Party.
The Japanese political process has two types of elections.
Takeru Inukai was a Japanese politician and novelist active in Shōwa period Japan. Also known as "Inukai Ken", he was the third son of Prime Minister of Japan Inukai Tsuyoshi.
The 1955 system (55年体制), also known as the one-and-a-half party system, is a term used by scholars to describe the dominant-party system that has existed in Japan since 1955, in which the Liberal Democratic Party (LDP) has successfully held by itself or in coalition with Komeito a majority government nearly uninterrupted with opposition parties, other than for brief stints in 1993–1994 and 2009–2012, largely incapable of forming significant or long lasting alternatives. The terms 1955 system and the one-and-a-half party system are credited to Junnosuke Masumi, who described the 1955 system as "a grand political dam into which the history of Japanese politics surge".
General elections were held in Japan on 10 April 1946, the first after World War II, during the Allied occupation. Voters had one, two or three votes, depending on how many MPs were elected from their constituency. The result was a victory for the Liberal Party, which won 141 of the 468 seats. Voter turnout was 72.1 percent.
Yamaguchi 4th district is a single-member electoral district for the House of Representatives, the lower house of the National Diet of Japan. It is located in Western Yamaguchi and consists of the cities of Shimonoseki and Nagato. The seat was held by former Prime Minister of Japan Shinzo Abe until his assassination in July 2022. As of September 2011, 266,456 voters were registered in the district, giving its voters well above average vote weight. Unlike many prefectures where the capital is also the most populous city, Yamaguchi's major city is Shimonoseki, located at the western tip of Honshū and adjacent to Kyushu island's Fukuoka-Kitakyūshū metropolitan area which lies just south across the Kanmon Straits.
The Murayama Cabinet governed Japan under the leadership of Prime Minister Tomiichi Murayama from 1994 until a 1995 Cabinet Reshuffle. Murayama was elected prime minister by the National Diet on 29 June 1994 after the threat of a no-confidence vote had brought down the previous minority Hata Cabinet. Murayama's and his cabinet's formal investiture by the Emperor took place one day later.
The Katayama Cabinet governed Japan under the premiership of Tetsu Katayama from 24 May 1947 to 10 March 1948, during the Allied occupation. It was the first cabinet under the postwar constitution.
General elections were held in Japan on 22 October 2017. Voting took place in all Representatives constituencies of Japan – 289 single-member districts and eleven proportional blocks – in order to appoint all 465 members of the House of Representatives, the lower house of the then 707-member bicameral National Diet of Japan. Incumbent Prime Minister Shinzō Abe's governing coalition of the Liberal Democratic Party (LDP) and the Komeito party retained their seats in signs of what was perceived as weak opposition. The PM won his fourth term in office and held on to the two-thirds supermajority in order to implement policies on revising the war-renouncing Article 9 of the Japanese Constitution.
House of Councillors elections were held in Japan on 21 July 2019 to elect 124 of the 245 members of the House of Councillors, the upper house of the then 710-member bicameral National Diet, for a term of six years.
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