| 1983 | Elected as a Member of the House of Representatives, representing the 5th District of Hokkaido Currently serving his 6th term in office |
| 1993 | Appointed as the Deputy Chairman of the Liberal Democratic Party (LDP) Policy Research Council Appointed as the Director of the House of Representatives Committee of Security |
| 1996 | Appointed as the Chairman of the House of Representatives Committee on Health and Welfare |
| 1997 | Appointed as the Minister of Education, Science, Sports and Culture to serve under the cabinet of Prime Minister Ryutaro Hashimoto |
| 1998 | Appointed as the State Secretary for Foreign Affairs |
| 2000 | Appointed as the Special Adviser to Prime Minister Yoshiro Mori |
| 2000 | Appointed as the Chief Deputy Chairman of the LDP Diet Affairs Committee |
| 2000 | Appointed as the Minister of Education, Culture, Sports, Science and Technology to serve under the cabinet of Prime Minister Yoshiro Mori |
| 2001 | Appointed as the LDP Acting Secretary General |
| 2002 | Appointed as the LDP Director-General Election Bureau |
| 2004 | Appointed as Foreign Minister |
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