To facilitate the confirmation of whether or not the ROM already inspected is illegally replaced with the one called as an unauthorized ROM or an illegal ROM or whether or not the board case currently used is illegally replaced with a board case housing an illegal control board by easily checking to see if at least the board case is illegally taken off the inside of a cabinet.

In the game machine, an IC tag seal 270 having an IC chip 271 or the like as a memory means for storing non-contact readable IC tag identification information indicating the main board number or the like is stuck on the rear side of a board case mounted inside a cabinet body, comprising a body case 210 for housing the main control board 220 which is installed inside a casing and carries at least a ROM as the main component and the upper lid case 230.