Abstract: A coin processing device includes: a passage along which a coin is transferred from an upstream-end toward a downstream-end thereof; an opening formed on the passage; a gate including a guide section that constitutes a part of the passage while the opening is closed and has a stepped portion formed at a portion of the guide section which is closer to the downstream-end of the passage, the gate being tilted so as to lift a portion thereof which is closer to the upstream-end of the passage in a state where the opening is closed to open the opening; and a gate mechanism for causing the coin to fall though the opening by tilting the gate. In this coin processing device, while the gate is open, the stepped portion receives a portion of the coin in the direction of the upstream.