Japanese Periodicals Index: the number of articles exceeded 15 millions

The National Diet Library provides the Japanese Periodicals Index as a search tool for Japanese periodical articles from 1949 onwards. As of 13 September, the number of records exceeded 15 million.

The Japanese Periodicals Index indexes about 11,000 periodicals. Its scope in the field of periodicals and the volume of its records make it one of the leading databases of periodical articles in Japan.

In addition to the services provided by the National Diet Library (e.g. NDL Search), this database is also widely used, for example, in CiNii Research of the National Institute of Informatics and in WorldCat of OCLC, Inc.