| July 2007 | Present Assignment |
| September 2006 | Special Advisor to the Prime Minister for National Security Affairs |
| September 2004 | Minister of the Environment Minister of State for Okinawa and Northern Territories Affairs |
| September 2003 | Minister of the Environment |
| June 2000 | Member of the Committee on Economy, Trade and Industry, Committee on Foreign Affairs, Committee on Security, Committee on Rules and Administration, H.R. |
| October 1999 | Parliamentary Secretary for the Economic Planning Coordination |
| November 1998 | Director, Standing Committee on Finance, H.R. |
| September 1997 | Chair of the Standing Committee on Science and Technology, H.R. |
| August 1993 | Vice-Minister of Management and Coordination Agency |
| July 1993 | Elected to the House of Representatives (H.R. 5 terms up to the present)
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| August 1992 | Elected to the House of Councillors
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| @ | Anchor for TV News Programs |