To facilitate a belt for a bill rolling device or the like, and a belt meandering prevention means.

An endless belt is stretched among a plurality of rollers 3, 5, 7, 16, and at one side plate 14 forming the body of this device, an insertion/ extraction hole is formed. Covering 71 is detachably-formed at the outer surface of one side plate, and rollers are detechably-mounted between the covering 71 and the other side plate 15. The belt and the respective rollers 3, 5, 7, 16 are inserted and extracted from the insertion/extraction hole. In The control roller 3, a belt meandering prevention means 63 preventing the belt from meandering is mounted on a shaft end part 31 toward one side plate 14.