Due to the approach of typhoon Nabi (T 0514) to Kyusyu and Chugoku region from 6^th to 7^th September 2005, total rainfall was recorded more than 400 mm in western part of Hiroshima Prefecture. Also, in the Miyajima Island which lay in the highly weathered granite area, it was recorded that total rainfall was 237 mm and 33 mm of maximum hourly precipitation, and a debris flow occurred by the rainfall. The sediment was yielded more than about 31, 000 m³ by the debris flow, and about 15, 000 m³ sediment were flushed through the Shiraito River which located at the back of Itsukushima Shrine. Two existing sabo dams trapped about 8, 000 m³, but other transported sediment of about 7, 000 m³ was deposited in the residential area. The human damage was one and it was not seriously injured, fortunately. The Hiroshima Prefectural Government took the emergent countermeasures, and is going to construct sabo dams at the stream as the permanent countermeasure against debris flow disasters.