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Statistics

Statistics by fiscal year are available at "Annual Report of the National Diet Library".

Please see "Finance" page for budget information.

The NDL in figures (Key statistics of FY 2021)

Buildings and storages (Approximate)

  Total site area Total floor space Total area of reading rooms Total storage space Storage capacity *
Tokyo Main Library 30,000m2 148,000m2 19,000m2 78,000m2 12,000,000 volumes
Kansai-kan of the NDL 83,000m2 84,000m2 4,300m2 39,000m2 11,000,000 volumes
ILCL 7,700m2 13,000m2 2,100m2 3,100m2 1,050,000 volumes

* Storage capacity is calculated based on a book thickness of 3cm.

Collections (domestic and foreign publications)

  Total acquisitions Annual acquisition
Total 46,217,530 items 727,803 items
Books 11,927,978 items 192,755 items
Periodicals 13,197,995 items 276,625 items
Newspapers 6,741,346 items 193,385 items
Microforms 9,054,704 items 8,311 items
Video recordings 407,691 items 21,394 items
Audio recordings 801,843 items 13,576 items
Machine-readable materials
(CDs, DVDs, etc.)
173,373 items 6,273 items
Maps 594,435 items 4,265 items
Musical scores 28,698 items 2,086 items
Doctoral dissertations 600,132 items 1,972 items
Manuscripts 423,985 items 4,175 items
Braille and large print 48,382 items 2,798 items

Services

Services for the public
Reference services 384,645 cases
Reading services 1,341,818 items
Photoduplication services 854,856 cases
Remote photoduplication services 309,904 cases
On-site users 383,820 people
Tokyo Main Library 246,213 people
(886 per day on average)
Kansai-kan of the NDL 70,403 people
(254 per day on average)
ILCL 67,204 people
(237 per day on average)
Digital Library services
Visitors to our website 29,491,325 cases
Viewers of digitized materials on the NDL Digital Collections 92,074,555 cases
Viewers of contents on the Web Archiving Project 36,683,720 cases
Digitized materials available on the NDL Digital Collections
Number of digitized materials
4,329,866 items
Number of materials available via the internet 1,767,474 items
Available at partner libraries 1,538,914 items
Available only at the NDL 1,023,478 items
Materials digitized by the NDL (Approximate) 2,810,000 items
Number of materials available via the internet 570,000 items
Available at partner libraries 1,530,000 items
Available only at the NDL 720,000 items
Online publications collected by the NDL (Approximate) 1,400,000 items
Number of materials available via the internet 1,190,000 items
Available only at the NDL 220,000 items
Number of captures (Web Archiving Project) 217,707 items
Services for the Diet
Research on request 30,320 cases
Research on national policy issues 329 cases
Services for the executive and judicial branches of the government
Research and reference 529 cases
Loan services 4,705 items
Services for Libraries
Reference services 4,008 cases
Loan services 15,023 items
Libraries participating in the Collaborative Reference Database 881 libraries

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