Nobunori wrote his diary on the other side of case records and administrative documents while he was working as Mandokoro betto (Director of the Administrative Board) and Kurodo gashira (a kind of secretary and archivist to the Emperor), which also came to be important historical materials to understand the inside situation of the Sekkan family and the scope of Kurodo gashira's work.
信範が摂関家政所別当職や蔵人頭を務めていた際の訴訟・行政文書の裏が日記用の紙に使われており、摂関家の内部事情や蔵人頭の業務内容が伺える貴重な史料ともなっている。