[Problem] To suppress damage to a windmill blade due to a boundary layer separation phenomenon occurring on a blade suction surface of the windmill blade. [Solution] A wind power generator in which a rotor including lift-type windmill blades receives wind and rotates, to drive a generator to generate electric power, the wind power generator includes: at least one aperture that connects a closed space in the windmill blade and an outside of the windmill blade, provided on a blade suction surface of the windmill blade, the aperture being openable and closable.
