To provide a coin processing device which prevents a dishonest act using counterfeit coins.

This coin processing device is provided with a coin throwing-in part, a coin discrimination part which discriminates the forgery of a thrown-in coin, change storage cylinders classified by denominations, a change payment part which pays change from change storage cylinders, a return passage connected to a return hole, a coin carrying part which carries the coin to the coin throwing-in part or the return hole, a safe passage connected to a safe, a coin distribution part which directs the coin discriminated as a true coin by the coin discrimination part to change storage cylinders classified by denominations, the safe passage, or the coin carrying part and directs the coin discriminated as a forgery by the coin discrimination part to the return passage, and a coin carrying part connection passage which connects the coin distribution part and the coin carrying part.