| August 2007 | Minister of State for Economic and Fiscal Policy (1st Abe Reshuffled Cabinet) |
| September 2006 | Minister of State for Economic and Fiscal Policy (Abe Cabinet) |
| April 2004 | Director General for Economic Research in Cabinet Office (until August 2005) |
| March 2003 | Deputy Director General for Economic Research in Cabinet Office |
| April 2002 | Director of Policy Analysis in Cabinet Office |
| May 2001 | Professor of National Graduate Institute for Policy Studies |
| October 1997 | Associate Professor of National Graduate Institute for Policy Studies |
| April 1996 | Associate Professor of Saitama University Graduate School of Political Science |
| May 1981 | Research fellow of Japan Institute of Life Insurance |
