The chief librarians of the branch libraries of the Executive and Judicial agencies are appointed from among the administrative and technical officers, but the position of appointment is given to the chief librarian of the NDL, who is a staff of the Legislative branch of the government.
行政・司法各部門支部図書館の館長はそれぞれの事務官・技官から任命されるが、その任命権は立法府の職員である国立国会図書館長に与えられている。