National Diet Library
| National Diet Library (NDL) | |
|---|---|
| 国立国会図書館 (Kokuritsu Kokkai Toshokan) | |
Tokyo Main Library of the National Diet Library | |
| 35°40′42″N 139°44′39″E / 35.67833°N 139.74417°E | |
| Location | Tokyo and Kyoto, Japan |
| Type | National Library, Parliamentary Library |
| Established | 1948 |
| Architects | Maekawa Associates, Architects & Engineers |
| Reference to legal mandate | National Diet Library Law |
| Branches | 27 |
| Collection | |
| Items collected | Books, Journals, Newspapers, Electronic archives, Manuscripts, Official publications, Doctoral dissertations, Maps and Sheet music |
| Size | 48,113,609 items (Key statistics of FY 2024) |
| Criteria for collection | Publications issued in Japan, statutes and parliamentary documents, publications on Japan, reference material, material on science and technology, publications of international organizations and foreign governments, children's literature and related material, Asian works |
| Legal deposit | Yes |
| Access and use | |
| Access requirements | 18 years old and above for the Tokyo Main Library and the Kansai-kan |
| Population served | Members of the Diet and the general public. |
| Other information | |
| Budget | JP¥20,426M (FY2025) (approx. US$130.6M as of 2026) |
| Director | Keiko Kurata (2026) |
| Employees | 895 (as of April 2025) |
| Website | www |
The National Diet Library (NDL) (国立国会図書館, Kokuritsu Kokkai Toshokan) is the national library of Japan and among the largest libraries in the world. It was established in 1948 for the purpose of assisting members of the National Diet of Japan (国会, Kokkai) in researching matters of public policy. The library is similar in purpose and scope to the United States Library of Congress.
The National Diet Library (NDL) consists of two main facilities in Tokyo and Kyoto, and several other branch libraries throughout Japan.