To unerringly prevent a failure in capturing a command in an electrical part control means receiving a command from a game control means.

A power cutoff signal outputted by a power monitoring IC 902 loaded on a power board 910 is inputted to a nonmaskable interrupt terminal of a CPU 56 loaded on a main board 31. The CPU 56 operates in accordance with a program stored in a ROM and performs a power supply stoppage process and outputs a power cutoff signal to a putting-out control board 37 when recognizing input of the power cutoff signal from the power board 910. In the putting- out control board 37, a power cutoff signal is inputted to the nonmaskable interrupt terminal of a putting-out control CPU 371 operating in accordance with the program stored in the ROM. The putting-out control CPU 371 executes a subsidiary side power supply stoppage process when recognizing input of the power cutoff signal from the main board 31.