Father: Junya Samejima, member of the House of Representatives and director general of the Japan Defense Agency. (He adopted his wife’s family name of Koizumi when they wed.)
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.
Koizumi’s ex-wife, Kayoko Miyamoto, was six months pregnant with youngest son, Yoshinaga, when the couple divorced.
1969 – Unsuccessfully runs to fill the House of Representatives seat vacated when his father, Junya Koizumi, dies.
1970-1972 – Secretary to Takeo Fukuda, member of the House of Representatives at the time, and later, prime minister of Japan.
1972 – Is elected to the House of Representatives.
1980 – Chairman of the Finance Committee of the Liberal Democratic Party (LDP).
1983 – Deputy Secretary General of the LDP.
1987 – Chief Deputy Chairman of the Diet Affairs Committee, LDP.
1988 – Is named minister of health and welfare under Prime Minister Noboru Takeshita.
1989 – Is named minister of health and welfare under Prime Minister Sosuke Uno.
1991 – Chief Deputy Secretary General of the LDP.
1992 – Minister of Posts and Telecommunications under Prime Minister Miyazawa. Resigns this position when the new administration comes to power.
1995 – Unsuccessful run for president of the LDP.
1996 and 1997 – Is appointed Minister of Health and Welfare in both Prime Minister Hashimoto’s cabinets.
1998 – Unsuccessful run for president of the LDP.
April 24, 2001 – Is elected president of the LDP, defeating incumbent Ryutaro Hashimoto.
April 26, 2001 – Is named Japan’s 86th prime minister.
September 20, 2003 – Is re-elected as president of the LDP.
September 21, 2005 – Is re-elected as prime minister.
September 26, 2006 – Steps down as prime minister and returns to the House of Representatives.
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.
January 2014 – Endorses former Japanese Prime Minister Morihiro Hosokawa for Tokyo Governor.
May 7, 2014 – Is a co-founder of the Japan Assembly for Nuclear Free Renewable Energy, a council against nuclear energy.