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In 2023, by-elections were held in Japan in order to fill vacancies in the House of Representatives and the House of Councillors, the two houses of the National Diet of Japan.

April by-elections

On 23 April 2023, 5 by-elections were held together with the second phase of the unified local elections (municipal elections except designated major cities), including Yamaguchi 4th district, the seat of former Prime Minister Shinzo Abe who was assassinaed on 8 July 2022.

The ruling Liberal Democratic Party and opposition Japan Innovation Party both made 1 pickup, flipping an Independent and a Democratic Party for the People seat respectively.

October by-elections

The October by-elections were held on 22 October 2023 after Nagasaki 4th district representative Seigo Kitamura's death and the resignation of Tokushima-Kōchi at-large district representative Kojiro Takano after beating his secretary. Both representatives were members of the Liberal Democratic Party.

The LDP lost 1 upper house seat to Independent Hajime Hirota who was backed by opposition parties Constitutional Democratic, Communist, and Social Democratic.

References

1. "Upcoming April by-elections likely litmus test for Kishida's leadership". The Japan Times. 2023-03-06. Retrieved 2023-04-19.
2. McCurry, Justin (2023-04-10). "Japan ruling party triumphs in local elections despite criticism over links to Moonies". The Guardian. ISSN 0261-3077. Retrieved 2023-04-19.
3. Johnston, Eric (2023-04-24). "Kishida rules out snap poll after LDP wins big in Sunday by-elections". The Japan Times. Retrieved 2023-04-24.
4. "LDP lawmaker Kentaro Sonoura to resign over political funds scandal". The Japan Times. 2022-12-19. Retrieved 2023-04-19.
5. "岸本周平氏の辞職許可 和歌山知事選出馬へ—衆院：時事ドットコム". 時事ドットコム (in Japanese). Retrieved 2023-04-19.
6. Johnston, Eric (2023-02-27). "Yamaguchi by-election puts spotlight on dynastic politics". The Japan Times. Retrieved 2023-04-19.
7. "Shinzo Abe: How the former Japan PM's assassination unfolded". BBC News. 2022-07-08. Retrieved 2023-04-19.
8. "安達参院議員の辞職許可 | 政治 | 全国海外 | 神戸新聞NEXT". www.kobe-np.co.jp (in Japanese). 2023-03-10. Retrieved 2023-04-19.
9. "令和5年10月22日執行 衆議院小選挙区選出議員補欠選挙（長崎県第4区） | 長崎県". www.pref.nagasaki.jp. Retrieved 2023-10-22.
10. "秘書殴った自民・高野光二郎参院議員が辞職、補欠選挙は１０月２２日". 読売新聞オンライン (in Japanese). 2023-06-22. Retrieved 2023-10-22.
11. ^ "秘書殴った自民・高野光二郎参院議員が辞職、補欠選挙は１０月２２日". Yomiuri Shimbun (in Japanese). 2023-06-22. Retrieved 2023-07-13.
12. 日本放送協会. "参院補選 徳島高知 | NHK選挙WEB". www.nhk.or.jp (in Japanese). Retrieved 2023-10-22.
13. Nagasaki prefectural government, prefectural electoral commission announcements: 令和5年10月22日執行予定 衆議院小選挙区選出議員補欠選挙（長崎県第4区）, retrieved 2023/7/13.

See also

• Elections in Japan

v t e Elections in Japan
General elections	1890 1892 1894 (Mar) 1894 (Sep) 1898 (Mar) 1898 (Aug) 1902 1903 1904 1908 1912 1915 1917 1920 1924 1928 1930 1932 1936 1937 1942 1946 1947 1949 1952 1953 1955 1958 1960 1963 1967 1969 1972 1976 1979 1980 1983 1986 1990 1993 1996 2000 2003 2005 2009 2012 2014 2017 2021 2024 Next
Councillors elections	1947 1950 1953 1956 1959 1962 1965 1968 1971 1974 1977 1980 1983 1986 1989 1992 1995 1998 2001 2004 2007 2010 2013 2016 2019 2022 2025
Unified local elections	1947 1951 1955 1959 1963 1967 1971 1975 1979 1983 1987 1991 1995 1999 2003 2007 2011 2015 2019 2023
Supreme Court retention elections	1949 1952 1955 1958 1960 1963 1967 1969 1972 1976 1979 1980 1983 1986 1990 1993 1996 2000 2003 2005 2009 2012 2014 2017 2021 2024
See also: Gubernatorial elections Prefectural Assembly elections

• By-elections in Japan
• 2023 elections in Japan
• April 2023 events in Japan
• October 2023 events in Japan