| September 2011 | Minister of Finance (Noda Cabinet) |
| January 2011 | Chairman of Diet Affairs Committee, DPJ |
| September 2010 | Vice-Minister of Defence (Reshuffled Kan Cabinet) |
| June 2010 | Chairman of the Election Strategy Committee, DPJ |
| August 2009 | Chairman of the Security Committee, DPJ |
| September 2007 | Deputy Chairman of Diet Affairs Committee, DPJ |
| August 2006 | Chairman of the Special Committee for the Northern Territorial Issues
in the House of Representatives |
| October 1996 | Elected as a Member of the House of Representatives (1st) |
| April 1985 | Joined Japan Broadcasting Corporation (NHK) (left in 1993) |
