A coin receiving device in a coin processing apparatus is provided with a flat belt stretched around a pair of rollers substantially horizontally. A reverse rotation roller is disposed above the flat belt so that it is parallel with the axial line of the rollers, and the lower circumferential face is separated from the flat belt by a distance which is larger than thickness of a coin. A movable restrictor is disposed above the reverse rotation roller, which extends upstream of the flat belt in substantially parallel with the flat belt. A distance between the movable restrictor and the top face of the flat belt is smaller than a diameter of a coin having the largest diameter. The movable restrictor is convex toward an upstream direction of the flat belt. The movable restrictor is replaceably attached to a frame.