Sei Hiraizumi (平泉 成, Hiraizumi Sei, born on June 2, 1944 in the former Nukata, Aichi) is a Japanese actor. In 1964, Hiraizumi joined Daiei Film company and started his acting career.In the 1970s to early 1980s, he appeared in a lot of jidaigeki and detective television dramas as a guest villain actor. Hiraizumi starred as Koichi Matsudo in L: Change the WorLd and he also starred in Osaka Tough Guys.