To provide a game machine which can obstruct an unfair act to use an unfair tool inserted through a token inlet.

In a condition a token 38 is not thrown in, a movement member 51 is placed at a contact position (A) to block a guide passage 35 by energizing force of a torsion spring 52. When a token 38 is thrown in, the movement member 51 is pushed downward by the token 38 flowing down in the guide passage 35 and turned counterclockwise centering on a rotation axis 56 (B). Associated with passage of the token 38, the movement member 51 is turned to an open position (C). By turning of the movement member 51 from a contact position to a stand-by position, an unfair act detecting sensor 55 detects an arm part 51b to output a movement signal. A continuation time when a movement signal is continuously outputted is measured by a timer and simultaneously whether the continuation time is within a prescribed time or not is judged. When the continuation time is judged to be over the prescribed time, it is judged that there is possibility of inserting an unfair tool and alarm sound is emitted through a speaker.

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