To provide a game machine and the like in which a sub-substrate immediately allows an error indication to be displayed and an alarm to be sounded to notify people of a fraud act in a hall when a radio fraud act is performed.

In a game machine, when a fraud act is performed in the (N+1)th game, a sub control unit 160 cannot receive a present command and a previous command, which are transmitted by a main control unit 100. Thus, the sub control unit 160 continues to store a present command (losing by 1) received in the Nth game as a previous command in a RAM 162 as it is. The main control unit 100 transmits a present command (belling by 50) and a previous command (ART ends and replay by 100) in the (N+2)th game to the sub control unit 160. The sub control unit 160 receives the present command and the previous command, which are transmitted by the main control unit 100, and if the received previous command (ART ends and replay by 100) does not correspond with a previous command (losing by 1) to be stored when comparing them, it determines that the game machine is abnormal in order to perform error processing.