| 摘要 |
PROBLEM TO BE SOLVED: To provide a security system for a game arcade which can accurately monitor the entrance and exit of persons at night or the like without installing a special device for a game customer passage. SOLUTION: A light-receiving means (35) placed on the other side receives detection light emitted by a light-emitting means (43) placed on one side of accessory devices (12, 22) provided in an opposing relation with a game customer passage (7) between and when the detection light received by the light-receiving means (35) is intercepted by the situation change in the game customer passage (7), an informing means (51) for informing the interception of the detection light is operated.
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