As for 東禅寺版 (the South Song Dynasty Edition of the Buddhist Canon), there are 36 lines of letters on one piece of paper. Each paper is divided into six. In 東禅寺版, there are books which have a five pages paper. A purpose of this article is to clarify reason for being of the five pages paper. The document for this article is the 東禅寺版 in Daigo-ji Temple (醍醐寺). It is the most suitable document for achievement of purpose of this report. As a result of having investigated the whole, the following things became clear. １. There is the five pages paper in the middle of the books. ２. There is a note such as "此帋除六行得粘縫兩邊無厚薄" in the five pages paper. ３. The five pages paper was put to make a book flat. ４. The papers came to be put in books after 1094.