Belt drive apparatus and image forming apparatus

摘要

A belt drive apparatus includes: a rotatable first roller; a rotatable second roller; a belt member stretched by the first and the second rollers so as to be capable of being conveyed by the first roller and the second roller; and a restraint member provided on at least one of the two ends of the second roller and including a belt receiving surface to be brought into contact with an edge portion of the belt member. The belt receiving surface and an axis of the second roller make an angle that is not smaller than 93° but not larger than 115°.