The team from Waseda University has been excavating on the hill-top at Abusir-South in Egypt since 1991, and unearthed the stone structure belonging to the Prince Khaemwaset. This article deals with a style and a drainage technology of the roof on the portico of the structure. It was supposed that the upper point edges of the roofs were cut diagonally and were extended beyond the front of the architrave, like eaves, which style is similar to that of Old Kingdom. On the drainage technology, joints between roof blocks were alternately made watertight by the insertion of T-shape section stones and also used as a gutter, though the reason is unclear.
