Last updated
CiNii logo.svg
Producer National Institute of Informatics (Japan)
Languages Japanese, English
CostFree; Subscription for full-text
Record depthIndex, abstract & full-text
Format coverageJournal articles and books
Temporal coverage1906–present
Geospatial coverageJapan
No. of records22 million

CiNii ( /ˈsn/ ) [1] is a bibliographic database service for material in Japanese academic libraries, especially focusing on Japanese works and English works published in Japan. The database was founded in April 2005 and is maintained by the National Institute of Informatics. [2] The service searches from within the databases maintained by the NII itself [NII Electronic Library Service (NII-ELS) and Citation Database for Japanese Publications (CJP)], as well as the databases provided by the National Diet Library of Japan, institutional repositories, and other organizations. [3]


The database contains more than 22 million articles from more than 3,600 publications. [4] A typical month (in 2012) saw more than 30 million accesses from 2.2 million unique visitors, [5] and is the largest and most comprehensive database of its kind in Japan. Although the database is multidisciplinary, the largest portion of the queries it receives is in the humanities and social sciences field, perhaps because CiNii is the only database that covers Japanese scholarly works in this field (as opposed to the natural, formal, and medical sciences which benefit from other databases). [6]

Database identifiers

The database assigns a unique identifier, NII Article ID (NAID), to each of its journal article entries. [5] A different identifier, NII Citation ID (NCID or 書誌ID) aka NACSIS-CAT Record ID, is used for books.

NCID examples

Identifiers are also assigned to authors of books, and of journal articles, in two separate series (so an author may have a different identifier value in each). For example, Shinsaku Kimoto is DA00432173 for books and 9000002393144 for journal articles.

See also

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NCID may refer to:


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  1. "About CiNii". CiNii. Retrieved 2014-02-23.
  2. 大向一輝 (Ohmukai, Ikki) (2009). "学術情報プラットフォームとしてのCiNii". Current Awareness (301). CA1691.
  3. "Databases Incorporated". CiNii. Retrieved 2014-02-23.
  4. "titlelist_els.tsv". CiNii. 2014-02-15. Retrieved 2014-02-23.
  5. 1 2 大向一輝 (Ohmukai, Ikki) (2012). "System design and data modeling of CiNii articles". The Journal of Information Science and Technology Association. 62 (11): 473–477.
  6. 日詰梨恵 (Hizume, Rie); 逸村裕 (Itsumura, Hiroshi) (2010). "CiNii 収録率から見たわが国の学術情報電子化の現状:人文学4領域を対象に". 中部図書館情報学会誌. 50: 19–35. hdl:2241/105270.