After the enactment of the Japanese Constitution and the Imperial House Act drawn up in accordance with the Constitution in May of 1947, the term Koseki Ridatsu is used to refer to secession from the Imperial Family.
1947年（昭和22年）5月の日本国憲法の施行、および同憲法に基づく皇室典範の施行後は、皇族の身分を離れることを皇籍離脱という。