Along with the enactment of the Act, preparations for the establishment of a national library progressed, and the National Diet Library was established on February 25, 1948, with Tokujiro KANAMORI, a constitutional scholar who had served as the minister of state at the enactment of the Constitution of Japan, as the first chief librarian of the NDL..
同法の制定とともに、国会図書館の設立準備が進められ、初代国立国会図書館長には憲法学で日本国憲法制定時の憲法担当国務大臣だった金森徳次郎が迎えられて、1948年（昭和23年）2月25日に国立国会図書館は発足した。