To prevent chattering of a paper sheet detection signal, and to determine an advancing direction of the paper sheet by a simple structure.

A rotating body 11 having a contact part 11a abutted to the paper sheet P and a light shielding part 11b formed in such a manner of protruding is rotatably supported along a conveyance passage 22, and the rotating body 11 is provided with a rotating shaft 11c halfway between the contact part 11a and the light shielding part 11b, and is rotated in a forward or reverse direction in accordance with the advancing direction of the paper sheet P. A first optical sensor 12 for detecting rotation of the rotating body 11 in the forward direction and a second optical sensor 13 for detecting rotation in the reverse direction are arranged along a track of the light shielding part 11a.