 He was elected to the House of Representatives for the first time in 1993 after an unsuccessful run in 1990.Tatsuo Murayama, Yamamoto's father in law, was an LDP member of the House of Representatives who served as Minister of Finance and Minister of Health and Welfare.His uncle, Momotaro Yanagida, was mayor of the City of Moji (Fukuoka Prefecture) and a member of the House of Representatives.