She was one of the first group of women elected to the House of Representatives in 1946,[1] serving in parliament until 1958.
Born in Yokohama in 1907, Matsuo was educated at Ferris Japanese-English Girls' School.
[2] She was re-elected in 1947, 1949, 1952, 1953 and 1955 and became a member of the party's central executive committee.
In 1948 Finance Minister Izumiyama Sanroku [ja] was forced to resign after attempting to kiss Matsuo and Harue Yamashita.
She later joined the Liberal Democratic Party and became an advisor in Kanagawa Prefecture, as well as serving as chair of the Yokohama Citizens' Credit Union and president of the Matsuo Kosan company.