PURPOSE: To improve the operationability of a cleaning device for a conveying roller in such a way that the conveying roller can easily be rotated when the conveying roller is cleaned.

CONSTITUTION: A cleaning lever 40 is attached to an end 20d of a roller shaft 20c of a conveying roller 20 for discharge via a one-way clutch 42. When the roller 20 is to be cleaned, in order to rotate the conveying roller 20 for discharge, the cleaning lever 40 is rotated, so that the rotation of the cleaning lever 40 is transmitted to the roller 20 by means of the one-way clutch 42. In addition, while the conveying roller 20 is rotated little by little or by prescribed angles, substances sticking to the conveying roller 20 are removed by, for example, wiping them off with wet cloths.