To intensify a noise control measure against radiation noise applied to a game control means and reliably prevent malfunction of the game control means due to radiation noise.

A microcomputer 50 made up of a one-chip integrated circuit integrally having a data storage section made up of a CPU, ROM or RAM or the like or a computation processing section is provided on a control board 39, and a ferrite electromagnetic wave absorptive sheet 56 is pasted to the top face of the microcomputer 50. When the microcomputer 50 receives radiation noise, Mn-Zn ferrite powder filled in the electromagnetic wave absorptive sheet 56 reliably absorbs the radiation noise and prevents unerringly malfunction of operation by the computation processing section.