After the World War Ⅱ, under the instruction of the General Headquarters of the Allied Powers, it was decided to stop having privileges of nationalization for Imperial estates or Imperial family's belongings, because under the poor financial situation after having lost the War, it was not possible to manage the former scale of Imperial family, the eleven Miyake, fifty one members were to leave their position as members of the Imperial family excluding three direct Miyake, Chichibunomiya, Takamatsunomiya, and Mikasanomiya.
第二次世界大戦後には連合国軍最高司令官総司令部（GHQ）の指令に基づいて、皇室財産の国有化、皇族の財産に関する特権の停止などが決定され、敗戦後の窮乏した国家財政では従前の規模の皇室を維持できなくなったことから、秩父宮、高松宮、三笠宮の三直宮家を除く11宮家51人が皇族の身分を離れることとなった。