Japanese general election, 1947

The 23rd general elections of members of the House of Representatives (第23回衆議院議員総選挙, dai-nijūsankai Shūgiin giin sō-senkyo^?), the lower house of the National Diet of Japan, were held on 25 April 1947. The Japan Socialist Party won 144 of the 466 seats, making it the largest party in the House of Representatives following the election. Voter turnout was 67.9%. It was the last election technically held under the Meiji Constitution in preparation for the current Constitution of Japan which became effective several days later on 3 May 1947. The upper house of the Diet was also elected by the people under the new constitution, the first ordinary election of members of the House of Councillors had been held five days before.

Numerous prominent figures were elected to the House of Representatives for the first time in this election, including former Prime Minister and House of Peers member Kijuro Shidehara, then-Prime Minister and former House of Peers member Shigeru Yoshida, and future Prime Ministers Tanzan Ishibashi, Zenko Suzuki and Kakuei Tanaka.

Yoshida remained Prime Minister following the election, acting until a successor was appointed – under the new Constitution, the cabinet depends on parliamentary support and must resign in the first Diet session after a House of Representatives election.

The 1st National Diet convened on May 20. After early coalition negotiations, Socialist Komakichi Matsuoka was elected Speaker of the lower house on 21 May, Democrat Man'itsu Tanaka Vice-Speaker. The new constitution introduced a parliamentary system of government: the prime minister became elected by and responsible to the National Diet, with the House of Representatives now being able to override the upper house. On 23 May, both houses of the Diet elected the leader of the Socialist Party, Tetsu Katayama, as prime minister – virtually unopposed as Liberals and Democrats agreed to vote for Katayama even though coalition negotiations had not yet produced final results. SCAP Douglas MacArthur welcomed the choice, thereby reducing resistance by some politicians to a Socialist-led coalition government. The Socialists initially sought a Grand Coalition with the Liberals and possibly including Democrats and Cooperativists, but the Liberals refused. Katayama eventually formed a coalition with the Democratic Party and the Kokumin Kyōdōtō (People's/National Cooperative Party), it could also count on support by the Ryokufūkai (Green Breeze Society), the largest group in the House of Councillors. Katayama was ceremonially appointed by the Emperor on 24 May, the other ministers in the Katayama Cabinet on 1 June after the conclusion of the coalition negotiations.

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