To provide a coin processor which is small in size and capable of effectively and speedily separating coins into two kinds, a large diameter coin and a small diameter coin, and avoiding erroneous separation even when a plurality of coins are continuously inserted.

A coin processor comprises: a first coin passage 41 that is curved in whole and includes a first guide 21a which is arranged on one side wall of the passage and has a concave shape; and a second coin passage 42 which includes a rail inclined downwardly with respect to a downstream and has a space 12 that is formed on another side wall of the passage opposite to the first guide 21a and between the rail and a second guide 14 arranged above a coin rolling surface of the rail, and that is narrower than a diameter of a large coin and wider than a small coin. The rail of the second coin passage 41 and a part of the side wall along the rail are formed in an S shape.