To provide a wind power generation device easy to integrate for generating power with high efficiency.

The wind power generation device 1 comprises a wind receiving vane 2, a supporting rod 3 for supporting the wind receiving vane 2, a bearing 4 for holding the supporting rod 3 rotatably around its axial core, a vibration plate 5 on which the bearing 4 is mounted, a vibration plate holder 6 for holding the vibration plate 5, a spiral spring 7 for controlling the movement of the supporting rod 3 to hold the wind receiving vane 2 at a predetermined position in the state that the wind receiving vane 2 does not receive wind power and to return the wind receiving vane 2 at the predetermined position when the wind receiving vane 2 receives wind power and the wind receiving vane 2 and the supporting rod 3 are integrally rotated, and a piezoelectric element 9 mounted on the vibration plate 5. Power is generated in the piezoelectric element 9 by utilizing flexion or vibration which is generated in the vibration plate 5 with the wind receiving vane 2 receiving the wind power.