A belt driving apparatus is constructed so that the edge portion of a belt will not run over a stopper or be damaged. A belt is entrained about a plurality of rollers. A drive source is coupled to at least one of the plurality of rollers. The drive source drives the at least one of the plurality of rollers in rotation. A restriction member is provided in the vicinity of at least one longitudinal end portion of at least one of the plurality of rollers. The restriction member prevents the belt from moving outwardly in a longitudinal direction of the at least one of the plurality of rollers and preventing the belt from moving outwardly in a radial direction of the at least one of the plurality of rollers.