| 摘要 |
PROBLEM TO BE SOLVED: To prevent the tampering of inserting a tampering tool such as a wire or the like into the back of a game board from a winning ball collecting part side of the back of a pachinko game machine in advance. SOLUTION: In this pachinko game machine 1 where a game board 14 is mounted on a game board mounting frame 12 mounted at a back side of a front frame 4, and a mechanism board 33 is openably and closeably mounted to cover the back of the game board 14, a downward projecting tamperproof member 45 of a specific length is transversely mounted on the lower back of the game board mounting frame 12 at a lower side edge of the game board 14, in such a manner that it is located inside the mechanism board 33 when the mechanism board 33 is closed for preventing the intrusion of a tampering tool (a) such as a wire or the like into the back of the game board 4 from its lower part.
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