| 摘要 |
PROBLEM TO BE SOLVED: To simplify an injustice detecting structure, and to prevent a malfunction by arranging a detecting sensor of a game medium entering a predetermined specific area in a game machine or arranging a monitoring sensor having the same performance as this in a specific place of a game island, and outputting the detecting signal as an injustice detecting signal. SOLUTION: A penetrating proximity sensor using first winning ball detecting sensor 11 for detecting an entrance of a shooting ball is arranged in respective ball guiding covers 10 installed in front of a game board 2 in a state of guiding the shooting ball to respective starting winning holes 3c. A second winning detecting sensor and a third winning detecting sensor are respectively arranged in a third passage and a fifth passage. A shooting ball total number detecting sensor is arranged in a seventh passage. A monitoring sensor 15 having the same performance or the almost same performance as the first winning ball detecting sensor 11 is installed on the reverse of the game board 2 in the vicinity of a first winning ball detecting sensor 11 installing place. The detecting signal is outputted to an external part as an injustice detecting signal. Then, injustice can be detected with the simple constitution.
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