Abstract: When the power key on the remote controller 12 is pressed, the electromagnetic wave is sent from the remote controller 12 to the main unit 100 of the electric device and the switch circuit 23 or 43 as the first switching means is turned on. Upon turning on of the first switching means by the power key operation, the power starts to be supplied from the second power supply 22 or 41 serving as the stand-by power supply circuit to the load circuit required for stand-by operation such as the microcomputer 24 and the light receiver 10. After that, corresponding to the first infrared signal sent from the remote controller 12, the relay 3 as the second switching means is turned on so that the commercial AC power source 1 is supplied to the main power supply circuit 2 in the main unit 100 of the electric device and the load circuit for the ordinary operation in the main unit 100 (main circuit of the device) start operation.