| Nov. 1991 |
Joined Yamakuni, a wholesaler trading in the Ota Vegetable and Fruit Market, as the future successor of his family business, after leaving behind the life of an salaried employee |
| Nov. 1996 |
President of Yamakuni, as the third generation to inherit the business |
| Jan. 2003 |
President, Junior Chamber International Tokyo |
| Apr. 2005 |
Member of the Basic Policy Committee of the Industrial Structure Council, Ministry of Economy, Trade and Industry (METI) |
| Sep. 2005 |
Elected for the first time to the 44th House of Representatives (Tokyo 4th district) |
| Aug. 2009 |
Elected to the 45th House of Representatives as the second of the list of proportional representation candidates, while defeated in the single-seat district by a narrow margin |
| Director, Economy, Trade and Industry Division, Liberal Democratic Party of Japan (LDP); Director, Committee on Economy, Trade and Industry, the House of Representatives |
| Jul. 2010 |
Formulated the economic policy for the election manifesto for the House of Councilors election in summer, as Director of the Economy, Trade and Industry Division, LDP |
| Vice Minister, Administrative and Civil Servant System Reform, the LDP Shadow Cabinet |
| Director, Committee on Audit and Oversight of Administration, the House of Representatives |
| Nov. 2011 |
Triggered the budget screening session of the Diet, as Director of the Committee on Audit and Oversight of Administration, the House of Representatives |
| Dec. 2012 |
Elected for the third time to the 46th House of Representatives (Tokyo 4th district) |
| Parliamentary Vice Minister of Economy, Trade and Industry, METI |
