| October 2005 | Minister for Foreign Affairs |
| September 2003 | Minister for Internal Affairs and Communications |
| April 2001 | Chairman, Policy Research Council, LDP (until September 2003) |
| January 2001 | Minister of State for Economic and Fiscal Policy (until April 2001) |
| November 1998 | Chairman, Special Committee on Fiscal Structure Reform, HR (until December 1998) |
| November 1996 | Minister of State, Economic Planning Agency (until September 1997) |
| August 1993 | Deputy Secretary-General, LDP (until September 1995) |
| December 1992 | Director, Foreign Affairs Division, LDP (until August 1993) |
| November 1991 | Chairman, Standing Committee on Foreign Affairs, HR (until January 1993) |
| January 1991 | Chairman, Special Committee on Coal Issues, House of Representatives (HR) (until November 1991) |
| March 1990 | Director, Education Division, Liberal Democratic Party (LDP) (until December 1990) |
| December 1988 | Vice Minister for Education, Sports, Science and Culture (until June 1989) |
| October 1979 | Elected Member of the House of Representatives for the first time, elected nine times since. |
| January 1978 | Chairman, Japan Junior Chamber |
| June 1973 | Director, Japan Cement Association |
| May 1973 | President and CEO of Aso Cement Co., Ltd. (until December 1979) |
| November 1966 | Director of Aso Industry |
| August 1966 | Joined Aso Industry |
