Born:
 October 20, 1958, Tokyo
 
Education:
 1981 Waseda University, School of Political Science and
    Economics
 
Career:
 1986 graduated from The Matsushita Institute of
    Government and Management
 Secretary to a Member of the Senate
 1993 Member, House of Representatives (4 terms)
 2007 first elected to the Senate
 2013 second elected to the Senate
 2019 third elected to the Senate
 2025 fourth elected to the Senate
 
(Major posts in the Senate)
 2013 Chairman, Committee on Fundamental National
    Policies
 2018 Chairman, Committee on Land and Transport
 2020 Chairman, Committee on Environment
 2022 Vice-President
 2025 Chairman, Commission on the Constitution
 
(Major posts in the Government)
 2009 Senior Vice-Minister of Health, Labour and Welfare
 2011 Deputy Chief Cabinet Secretary
 2012 Minister of the Environment
    Minister of the Restoration from and Prevention of
    Nuclear Accident
    Minster of State for the Nuclear Emergency
    Preparedness
 
(Major posts in political parties)
 2016 Vice-President, The Democratic Party
 2019 Chair, The Constitutional Democratic Party of Japan
    Caucus in the Senate
 
Note: The Sangiin, which had been known as the House of Councillors, is called the Senate in English as of August 2026.

(as of October 26,2026)