To provide an AC voltage control device capable of adjusting a voltage of an inductive load connected to an AC power source by a simple method.

A magnetic energy regenerative switch in which a capacitor and an AC switch circuit are connected in parallel between an AC power source and an inductive load. After the AC switch circuit is turned on at the timing when the voltage of a capacitor is almost zero which occurs twice during one cycle of the AC power source, it is turned off when a preset time period (several milliseconds), which is the time required for charging/discharging of capacitor or more in a half-cycle of the AC power source or below, passes so that the current flowing the capacitor takes a route of the AC switch circuit only during a preset time period. By allowing a reactance voltage of the capacitor to be variable by extending/shortening the predetermined time period, a load voltage is adjusted.