TRANSFER DEVICE AND IMAGE FORMING DEVICE

PROBLEM TO BE SOLVED: To provide a transfer device that reduces speed change of an intermediate transfer belt due to an instantaneous load change at each of a plurality of process linear speeds, to reduce shock jitter, and to provide an image forming device including the transfer device.SOLUTION: A transfer device 32 includes: an endless intermediate transfer belt 5 stretched to be rotated by a plurality of rollers and allowing a toner image on an image carrier 1 to be transferred thereon; driving means for rotating one of the rollers; and a transfer member 15 in contact with a front surface which is an outer peripheral surface of the intermediate transfer belt, to from a transfer nip. The transfer device 32 operates at two or more process linear speeds and transfers the toner image carried on the front surface to a recording material held in the transfer nip. The transfer device includes inertia changing means for changing inertia of at least one roller member according to each process linear speed.