To provide a low-cost wind power generator, capable of having a sufficient rotation force, while the power generator is provided with a vertical rotation shaft and tabular vane bodies instead of vane bodies provided in S- shapes.

In this wind power generator, an impeller B is configured, such that plural vane bodies 8 are radially projectingly provided on a rotation shaft 7 supported by a top bearing 5 and a bottom bearing 6 of a structure body A comprising post bodies 1 and beam members 2, 2a. The vane body 8 is installed with hinge-equipped doors 10 opening only in a specific circumferential direction. Accordingly, even if the impeller B receives wind from any direction, opening and closing of the doors 10 causes the impeller B to rotate to generate power by the rotation force in one of power generators 3a, 4b, 3c.