The son of a truck driver, Katsuhito Yokokume(横粂勝仁) studied law at Tokyo University, graduating in March 2005. He passed the bar exam in November 2005.
In 2006, he appeared in the Ainori(あいのり) TV show as a participant.
In August 2009, he was elected as a member of the House of Representatives, representing the Southern Kantō proportional representation block on the DPJ list, he failed to win Kanagawa 11th district against the incumbent's son Shinjirō Koizumi(小泉進次郎).
