Born:
 November 23, 1957, Chiba Prefecture
 
Education:
 1976 Chiba Prefectural Chosei High School
 
Career:
 1976 Secretary to a Member of the House of Representatives
 1987 Member, Chiba Prefectural Assembly (5 consecutive
    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 and etc.)
 2012 Chairman, Committee on Land and Transport
 2016 Chairman, Committee on Budget
 2022 Chairman, Commission on the Constitution
    Chairman, Committee on Rules and Administration
 2026 President, Judge Impeachment Court
 
(Major posts in a political party)
 2024 Chairperson, Liberal Democratic Party (LDP) Diet
    Affairs Committee in the Senate
 2025 Secretary-General for the LDP 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)