On the external packing film 124 of the memory card insertion section vicinity of the bottom surface of the digital camera 100, the ROM chip and the print wiring 131 are surface-mounted, and one end of the print wiring 131 is connected to the ROM chip 130, and the other end is connected to the external connecting terminal 132 provided on the bottom surface of the digital camera 100. The identifying information in the ROM chip 130 is read out at the time of the operation of the digital camera 100, and is collated with the identifying information inside the camera, and when it can not be collated or it is not coincident, the power source of the camera is compulsively turned off.