The NDL, an organ of the State, belongs to the Diet, a legislative body of Japan, and is operated independently under the supervision of the Speaker of the House of Representatives and the President of the House of Councilors, as well as the Committees on Rules and Administration, which comprise the standing committees of both houses.
国立国会図書館は日本の立法府である国会に属する独立した国の機関で、衆議院および参議院の議長及び両議院に置かれる常任委員会である議院運営委員会の監督のもと自立して運営される。