An image forming apparatus includes a recording material carrying member for carrying a recording material, the recording material carrying member having a seam and being movable along an endless path; an image forming device for forming an image on the recording material carried on the recording material carrying member; wherein a length l of the recording material measured in a direction of movement of the carrying member, a distance a between a trailing edge of the recording material and a leading edge of the next recording material when the recording materials are continuously supplied to the recording material carrying member, and a circumferential length L of the recording material carrying member substantially satisfy:L=n(l+a)(n: integer).