Discover Japan's Academic Resources

CiNii Research: Searching for Japanese Academic Information
CiNii Research is an academic information search platform for knowledge discovery that allows you to search not only research results
and articles, but also books, research data, the researchers who produced those results, and information on research projects in an
integrated manner from over 180 million pieces of Japanese academic information.

CiNii Books: Searching for Books in University Libraries

You can search for about 13.24 million academic resources, including books, journals and classic manuscripts, held by over 1300
university libraries and other libraries across the country. You can also search which libraries hold the book you are looking for.

CiNii Dissertations: Searching for Japanese Doctoral Dissertations
You can search Japanese doctoral dissertations in a centralised and comprehensive way.
You can also display the full-texts via links where they are available.
[Contacts]
National Institute of Informatics
CiNii Oﬃce
ciradmin@nii.ac.jp
cir-auth-req@nii.ac.jp
Apply for Using CiNii
Address: 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo, Japan 101-8430

2023.10

Searching for Japanese Academic Information

Researchhttps://cir.nii.ac.jp/?lang=en

Knowledge Discovery through Integrated Search
You can easily conduct an integrated search for not only literature, but also research data, research project information, etc.,
via a simple interface.

ArticlesBooksover 50 million items

over 13 million items

Doctoral Dissertations

Research Projects

Research Dataover 1 million items

over 1 million items

over 700,000 items

Simple Search Function
You can search for a wide range of information by entering keywords in a single search window.You can also use theadvanced search function to narrow down your search by the availability of links to the full-text or by the data source.

Extensive Contents
The amount of data is increasing year by year. CiNii Research currently contains over 180 million data items.It contains
a variety of information on research, including articles, doctoral dissertations, Books, research data and projects.

Contribute to Open ScienceCiNii Research supports the research process by providing the essential knowledge for discovering issues and writing
papers across disciplines. The NII Research Data Cloud (NII RDC) is an information infrastructure that promotes
data-driven research and plays a role as a search infrastructure, thus contributing to the distribution of data.

TOPICCustomizing CiNii Research for Use(1) Institutional Authentication Service
By applying for this service, you can set up and display the Institutional OPAC/Link Resolver and refer tousage statistics.
(2) API Usage Registration ServiceWe provide an API (Application Programming Interface) for system integration.
You can use the four formats of OpenURL, OpenSearch, RDF or JSON-LD.

Enabling Deep Search by Linking DataCiNii Research supports your search by deepening the information by linking data through internal processing.

Variety of Databases

Searching for Japanese
Academic Information

ResearchArticles
JaLC, IRDB, NDL Digital Collections, etc.

Books and Journals

CiNii Books
Doctoral Dissertations

CiNii Dissertations

Identiﬁcation&Integration

Research Data

JaLC, IRDB, DataCite, etc.

Dataover 180 million items
Accessover 100 million per year

Projects

KAKEN

Link to External Databases
We are expanding links with databases speciﬁc to each research ﬁeld in addition to cross-disciplinary databases so thatyou can search for resources related to Japanese people comprehensively.

Linking Data through Identiﬁcation and IntegrationCiNii Research internally performs "data matching”, which links individual pieces of data, such as articles, research dataand Books, to deepen the information connected to a single piece of data. This "data matching" allows us to deeply
understand links and even relationships between pieces of data.

Wide Range of Applications
CiNii Research is used for a variety of purposes, including research, study and fulﬁlment of interests, and is accessed forover 100 million times a year from within and outside of Japan.

TOPIC[Important] Integration of CiNii Books/Dissertations
into CiNii ResearchWe are planning to integrate the data and functions of CiNii Books/Dissertations into CiNii Research.
We will announce the schedule and other details on the CiNii Help page.

Searching for Books in University Libraries

Books

https://ci.nii.ac.jp/books/?l=en

Extensive Data Held by Libraries
You can search for information on books and authors from over 13.24 million items (over 150 million volumes in total) held by
about 1,300 university libraries and other libraries in Japan that have been accumulated in the NACSIS-CAT, a bibliographic
information service, operated by the National Institute of Informatics.

Searching for Books
in University Libraries

University Libraries

Books

Bibliographic Data

Prefectural Libraries
Participate

Special Libraries

over 13.24 million
items

BibliographicInformation
Service(NACSIS-CAT)

Librariesʼ Collection Dataover 150 million
volumes

Overseas Institutionsetc.

Searching for Japanese Doctoral Dissertations

Dissertations

https://ci.nii.ac.jp/d/?l=en

The Only Centralised Search Servicefor Japanese Doctoral Dissertations
You can search for Japanese doctoral dissertations held and digitised by the National Diet Library, as well as those held by
each universityʼs institutional repository in a centralised way.

Databases

Searching for JapaneseDoctoral Dissertations

Dissertations
Universities, Research Institutions, etc.

Institutional Repositories

National Diet Library

NDL-OPAC

National Diet Library

NDL Digital Collection

Identiﬁcation&Integration

Doctoral Dissertation Dataover 700,000 items
Full-texts

over 350,000 items