Hideki Tōjō (Kyūjitai: Shinjitai: ') (December 30, 1884 – December 23, 1948) was a general of the Imperial Japanese Army (IJA), the leader of the Taisei Yokusankai, and the 40th Prime Minister of Japan during most of World War II, from October 17, 1941 to July 22, 1944. As Prime Minister, he was directly responsible for the attack on Pearl Harbor, which led to the war between Japan and the United States, although planning for it had begun before he entered office.