To provide a coin selector in which illegal access to a coin sensor for authentic coin detection is prevented, which can be downsized, and which achieves a fast coin processing speed.

In the coin selector which detects the passing of coins based on a signal from a sensor disposed downstream of an authenticity determination part formed along a rolling pathway where coins roll in one direction, a pathway in the direction opposite to that of the coin rolling direction is provided downstream of the rolling pathway, and a coin sensor is disposed in the pathway of the opposite direction.