To give a disk-shaped body such as a medal electronic identification information and prevent fraudulent employment of the disk-shaped body by providing a game table device or a counter with a means for detecting in a noncontact manner the identification information.

An IC chip 4 provided with a power source generating means for generating electric power by receiving electromagnetic waves shot from an external device via an insulating layer 2b and an accumulating means for sending out identification information accumulated with generation of electric power on the surface 2a of a disk-shaped metal substrate 2 and an antenna 3 for giving out the identification information to the outside are included, where the surfaces of which are coated with a resin 5.