To provide a circuit board case of a game machine in which the management/monitoring of the circuit elements actually fitted to the circuit substrate of the game machine is secured by preventing the unfair exchange of the circuit elements, by means of projected members erected on the rear side of the upper cover, and at the same time by the visual inspection of the indicating articles through the transparent upper cover.

On the rear side of an upper cover 13A, the projected members 41 to 47 are erected. When the main board is sealed by the chassis and the upper cover 13A, it is erected not so as to interfere with the circuit elements of the main board. When the main board is sealed by the chassis and the upper cover 13A, as shown by the two-dot chain line, the respective projected members 41 to 47 do not position above the actually fitted CPU31 and ROM33. Further, the CPU31 and ROM33 do not pass through between the projected members 41 to 47 and between the respective projected members 41 to 47 and the main board 11.