Birth place: Yokosuka, Kanagawa Prefecture, Japan
Father: Junya Samejima; he adopted his wife’s family name of Koizumi when they wed, member of the House of Representatives and director general of the Japan Defense Agency.
Mother: Yoshi Koizumi
Marriage: Kayoko Miyamoto (1978-1982, divorced)
Children: Sons: Kotaro Koizumi; Shinjiro Koizumi; Yoshinaga Miyamoto
Education: Keio University, Economics, 1967; Attended the London School of Economics.
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September 25, 2008 – Announces that he will not run for re-election in 2009 and that he is retiring from politics.
August 2009 – Shinjiro Koizumi wins the House of Representatives seat formerly held by his father, Junichiro Koizumi.
December 12, 2009 – The film “Mega Monster Battle: Ultra Galaxy Legends The Movie” is released. The character Ultraman King is voiced by Junichiro Koizumi.
November 2013 – Speaks out against Japan’s nuclear energy program amidst debate following the 2011 Fukushima disaster and current Prime Minister Shinzo Abe’s policy to restart the country’s idle reactors.
January 2014 – Endorses former Japanese Prime Minister Morihiro Hosokawa for Tokyo Governor.
