To provide a control board housing case for a game machine which is capable of preventing such fraudulence as inserting an electrode or the like into a position exposing a connector socket of a control board.

In the control board housing case 1, a plate-shaped connector spacer 51, having fitting openings 53a-53f for fitting connector sockets 73a-73f from outside and thick-wall fitting projecting faces 55a-55d to be fitted into connector connecting opening windows 24a-24d to close gap regions 59a-59d in the planar direction, is interposed between the control board 71 on which the connector sockets 73a-73f are mounted and a case body 2 having the connector connecting opening windows 24a-24d from which the connector sockets 73a-73f are exposed. With this structure, the connector spacer 51 is hardly deformable toward the front side and back side via the connector connecting opening windows 24a-24f, and as a result, the control board housing case is highly effective in preventing such fraudulence as to fraudulently form a gap between the connector spacer 51 and the connector connecting opening windows.