To provide a wind power generator capable of improving power generation efficiency and easily manufacturing and having a large quantity of power production per unit area, in a wind-turbine which can fold up wind-turbine blades in a direction opposite to a wind direction and acts on rotary force of a wind-turbine shaft by spreading the wind-turbine blades in the wind direction.

The wind power generator includes an installation base 10, a rotary shaft 20, a bearing 20', a C-shaped support stand 30, many inner blade mounting tools 40, many support bars, and many outer blade mounting tools 50, many support rings 60, vertical support bars 60', many wind-turbine blades 70, a support tool 80 arranged on the vertical rotary shaft 20 vertically formed between a group of the wind-turbine blades 70 at a multistage and connected on the C-shaped support stand 30 with a wire 81, a power generation means 90 arranged at a lower surface of a center section of the installation base 10, wind-turbine blade fixing means arranged on an upper part of the vertical rotary shaft 20 of the inner blade mounting tool 40 in a vertically movable state and fixing displacement of the wind-turbine blades 70, and a fixing means driving device arranged at a lower end side of the vertical rotary shaft 20.