To provide a substrate case for a game machine which can efficiently cool heat radiating parts arranged on the surface of a substrate, and at the same time, can miniaturize the case itself.

A second substrate case 27 is constituted of a cover body 31 which protects the front surface side of a substrate 50 on which an electronic part 51 and heat radiating parts 52 and 53 are mixingly arranged, and a case body 28 which protects the rear surface side of the substrate 50. Then, on the rear surface part 31a of the cover body 31, which is confronted with the surface side of the substrate 50, a first protective part 32 which corresponds with the height dimension of the electronic part 51, and a second protective part 36 which corresponds with the height dimensions of the heat radiating parts 52 and 53 are provided. In this case, the second protective part 36 is set to be higher than the first protective part 32 by a specified dimension. Then, the top and bottom side surfaces 36a and 36b of the second protective part 36 is provided with a plurality of upper heat radiating ports 37a and lower heat radiating ports 37b which discharge heat from the radiating parts 52 and 53 to the outside of the case.