After World War II, the Constitution of Japan, which came into force in 1947, defined the Diet as the sole law-making organ of the State, and that the House of Representatives and the House of Councilors, which comprise the Diet, should consist of "elected members, representative of all the people" (as the member of the Diet).
第二次世界大戦後、1947年（昭和22年）に施行された日本国憲法は、国会を唯一の立法機関と定め、国会を構成する衆議院・参議院の両議院は「全国民を代表する選挙された議員」（国会議員）で組織されると定めた。