| 2005 | State Minister/Director General, Defence Agency |
| 2004 | Chairman, Research Commission on Security, Liberal Democratic Party |
| 2003 | Chairman, Policy Research Council, Liberal Democratic Party |
| 2001 | Deputy Secretary General, Liberal Democratic Party |
| 2000 | Chairman, Public Relations Headquarters, Liberal Democratic Party
Minister of State for Economic and Fiscal Policy |
| 1999 | Deputy Chief Cabinet Secretary |
| 1998 | State Minister/Director General, Defense Agency
Vice Chairman, Research Commission on Tax, Liberal Democratic Party |
| 1997 | Deputy Chief Cabinet Secretary |
| 1996 | Chairman, Standing Committee on Finance, House of Representatives |
| 1995 | Chief Whip, Standing Committee on Rules and Administration, House of Representatives |
| 1994 | Vice Chairman, Diet Affairs Committee, Liberal Democratic Party |
| 1993 | Vice Chairman, Policy Research Council, Liberal Democratic Party |
| 1992 | Director, House Affairs Division, Liberal Democratic Party |
| 1991 | Chief Whip, Standing Committee on Commerce and Industry, House of Representatives |
| 1990 | Parliamentary Vice Minister of International Trade and Industry |
| 1983 | Member of the House of Representatives |