| April 1971 | Elected to the Hokkaido Prefectural Assembly |
| April 1975 | Elected to the Hokkaido Prefectural Assembly |
| April 1979 | Elected to the Hokkaido Prefectural Assembly |
| April 1983 | Elected to the Hokkaido Prefectural Assembly |
| July 1986 | Elected to the HR（House of Representatives）
（38th General Election）
（39th General Election） |
February 1990
- December 1990 | Parliamentary Vice-Minister, Hokkaido Development Agency |
December 1992
- August 1993 | Parliamentary Vice-Minister of Transport
|
| July 1993 | Elected to the HR（House of Representatives）
（40th General Election） |
| October 1996 | Elected to the HR（House of Representatives）
（41st General Election） |
November 1996
- September 1997 | Chairman of the Standing Committee on Commerce and Industry, HR（House of Representatives） |
October 1999
- June 2000 | Chairman of the Standing Committee on Judicial Affairs, HR（House of Representatives） |
| June 2000 | Elected to the HR（House of Representatives）
（42nd General Election） |
| April 26, 2001 | Minister of Agriculture, Forestry and Fisheries |
