The documents about the construction of Ishiyamadera-temple during the Nara period still exist, and the restoration research of the main hall has been examined. This paper focused on rafters and angle rafter and tried to restore the roof by examining document and drawing. The grade can be calculated from the dimensions of the listed rafter, and the advanced estimation of the material used for the main hall. As a conclusion, it is thought that the roof type was a hipped roof, and discovered the process of construction in ancient periods.
