Abstract
We analyzed the rate of Japanese journal articles archived in institutional repositories based on the data of Society Copyright Policies in Japan (SCPJ) database and CiNii. As a result of analysis, only about 0.9% of Japanese journal articles published during 2000-2009 were archived in institutional repositories. The archive rate was low in all fields. While articles published in Green, Blue or Yellow journals were more archived than others, the archive rate of those was only about 1.3%.
