This report presents damage to roofs of SPring-8, which is the world's largest third-generation synchrotron radiation facility at Harima Science Garden City in Hyogo Prefecture, caused by Typhoon No.0416 on August 30, 2004 and No.0418 on September 7, 2004. As the results of the field studies, it is considered that the damage to roofs was due to not the wind power by the typhoon but due to strength decrease of bolts which had fixed roof materials.
