A light deflector comprising: a reflector having a reflecting surface; a first movable unit having one end coupled to the reflector; a second movable unit having one end coupled to the reflector, the reflector disposed between the first movable unit and the second movable unit; a first piezoelectric element disposed on the first movable unit, the first piezoelectric element configured to deform the first movable unit; a second piezoelectric element disposed on the second movable unit, the second piezoelectric element configured to deform the second movable unit; a first supporting part coupled to the other end of the first movable unit; a second supporting part coupled to the other end of the second movable unit; an input part disposed on the first supporting part, the input part configured to receive a voltage to be applied to at least the second piezoelectric element; and a wire electrically connecting the second piezoelectric element and the input part through the reflector, the wire configured to transmit the voltage received by the input part, to the second piezoelectric element, wherein a light passing area (16, 17) where the first supporting part and the second supporting part do not exist is provided at each side of the reflector such that light reflected by the reflecting surface is transmitted through the light passing area (16, 17) when the reflector rotates, characterized in that the light deflector further comprises: a third piezoelectric element disposed on the second movable unit; a voltage output part disposed on the first supporting part, the voltage output part configured to output a voltage received from at least the third piezoelectric element; and another wire electrically connecting the third piezoelectric element and the voltage output part through the reflector. a reflector having a reflecting surface; a first movable unit having one end coupled to the reflector; a second movable unit having one end coupled to the reflector, the reflector disposed between the first movable unit and the second movable unit; a first piezoelectric element disposed on the first movable unit, the first piezoelectric element configured to deform the first movable unit; a second piezoelectric element disposed on the second movable unit, the second piezoelectric element configured to deform the second movable unit; a first supporting part coupled to the other end of the first movable unit; a second supporting part coupled to the other end of the second movable unit; an input part disposed on the first supporting part, the input part configured to receive a voltage to be applied to at least the second piezoelectric element; and a wire electrically connecting the second piezoelectric element and the input part through the reflector, the wire configured to transmit the voltage received by the input part, to the second piezoelectric element, wherein a light passing area (16, 17) where the first supporting part and the second supporting part do not exist is provided at each side of the reflector such that light reflected by the reflecting surface is transmitted through the light passing area (16, 17) when the reflector rotates, characterized in that the light deflector further comprises: a third piezoelectric element disposed on the second movable unit; a voltage output part disposed on the first supporting part, the voltage output part configured to output a voltage received from at least the third piezoelectric element; and another wire electrically connecting the third piezoelectric element and the voltage output part through the reflector. a third piezoelectric element disposed on the second movable unit; a voltage output part disposed on the first supporting part, the voltage output part configured to output a voltage received from at least the third piezoelectric element; and another wire electrically connecting the third piezoelectric element and the voltage output part through the reflector.