An image forming apparatus includes an image forming mechanism, a toner image carrier, a transfer unit, an application member, a pivot around which the transfer unit rotates, and an elongate hole which engages with the pivot and through which the pivot is movable in a longitudinal direction of the elongate hole. The transfer unit includes a transferor which opposes the toner image carrier, a pre-transfer guide, a post-transfer guide, and a first positioning member which positions the transferor with respect to the toner image carrier. The image forming apparatus further includes a second positioning member which engages with the first positioning member.