| Aug 2008 | Minister of Defense |
| Oct 2007 | Senior Director, Standing Committee on Budget, the House of Councillors |
| Aug 2007 | Acting Chairman, LDP Policy Board in the House of Councillors Deputy Chairman, Policy Research Council, LDP
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| Sep 2006 | Senior Vice Minister of Cabinet Office
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| Jan 2006 | Senior Director, Standing Committee on Rules and Administration, the House of Councillors |
| Oct 2004 | Chairman, Standing Committee on Foreign Affairs and Defense, the House of Councillors |
| Nov 2003 | Director, Standing Committee on Budget, the House of Councillors |
| May 2003 | Director, Special Committee on Personal Information, the House of Councillors |
| Jan 2002 | Chief Secretary, Administrative Reform Promotion Headquarters, LDP |
| Oct 2000 | Director, Standing Committee on Financial Affairs, the House of Councillors |
| Oct 1999 | Parliamentary Vice Minister for Finance |
| Aug 1998 | Director, Standing Committee on Budget, the House of Councillors |
| Apr 1998 | Director, Special Committee on Revitalization of Economy and Measures for Medium and Small Enterprises, the House of Councillors |
| Jul 1997 | Deputy Secretary-General for the LDP in the House of Councillors |
| Jul 1995 | Elected as a member of the House of Councillors |