The edition of the Dengyō Daishi shōrai mokuroku 伝教大師将来目録 by Saichō 最澄 （766–822）, which is included in the Taishō Canon, was based on a print from year 4 of Bunsei文政 （1821）. This catalog includes two separate lists, Taishū roku 台州録 （T. 2159） and Esshū roku 越州録 （T. 2160）. The extant Taishū roku, which is a true work of Saichō, was designated as a national treasure. However, the original edition of the Taishū roku is not extant, and the whereabouts of the manuscript upon which the print was based remain uncertain.
The present study examines a manuscript formerly kept in Ishiyamadera 石山寺, now held in the library of Waseda University, that has not been examined in past studies on the Taishū roku. It is noteworthy that there is a colophon in this manuscript written in 1171 （year 1 of Jōan 承安）, and there is no replacement of pages, something otherwise found in the printed Taishū roku. It is difficult to state that the manuscript is of good quality, since it contains examples of writting errors. However, without a doubt the manuscript is an important source that transmits the earlier form of the Taishū roku.
