Its collections include the administrative documents of Kyoto Prefecture since it was inaugurated, and many valued historical materials such as the 'To-ji Hyakugo Monjo' (100 case documents, of the To-ji Temple), a National Treasure, as well as general books.
収蔵品には一般図書のほか、京都府発足以来の行政文書、国宝の「東寺百合文書」（とうじひゃくごうもんじょ）のような貴重な歴史資料も数多く含まれている。