On June 1st, 1949, as a result of enforcement of the General Administrative Agency of the Cabinet Establishment Act, Kunaifu was changed to Kunai-cho, the Imperial Household Agency, and became an extra-ministerial bureau of the Prime Minister's Office, and the post of the deputy director of Imperial Household Agency was set under the Grand Steward of the Imperial Household Agency, and one Secretariat, three offices, two departments, and Kyoto Office were set up.
1949年（昭和24年）6月1日には、総理府設置法の施行により、宮内府は宮内庁となって総理府の外局となり、宮内庁長官の下に宮内庁次長が置かれ、1官房3職2部と京都事務所が設置された。