To provide a technique exactly preventing bird strike by effectively increasing a recognition rate of blades for not only birds approaching from the front or rear of a wind power generator but also birds approaching from the side.

This blade structure is for the wind power generator including a plurality of blades having a radial shape from a center part. The blades include winglets disposed near tips of the blades with prescribed angles maintained. A reflector reflecting light is disposed on a surface of at least one of the blades.