To provide an anti-theft device of a coin processing apparatus for surely preventing theft of coins from a return passage.

In the device composed of it body 1 and an electromagnetic valve module 2, a sliding movement groove 111, through wich a coin 4 moves, is disposed on a passage 11 rear side bottom part of the body 1; a return passage 112 from which the coin 4 is discharged is disposed on the front side of the groove 111; an electromagnetic valve 21 of the module 2 and a gate 22 elongating and contracting by the valve 21 are disposed, respectively, on both sides of the groove 111; a penetration groove 223 is disposed on a base part 221 of the gate 22; an anti-theft plate 225 extends upward on a sidewall which is adjacent to the passage 112 of the groove 223; and the coin 4 is stored, by passing through the groove 223 of the gate 22. When a perpetrator attempts to insert an elastic plate or another tool from the passage 112, since the rearward of the passage 112 is blocked by the anti-theft plate 225, entry of the elastic plate is blocked and the theft is prevented.

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