An image forming apparatus comprising an electrophotographic
photoreceptor, a charging unit, an exposure unit, a development unit, and
a transfer unit, wherein the image forming apparatus conducts charging,
exposure, development, and transfer while moving a circumferential
surface of the electrophotographic photoreceptor in a predetermined
direction, the image forming apparatus further comprises a controlling
unit which controls a moving velocity of the circumferential surface of
the electrophotographic photoreceptor so that a time required for
processes from charging to development is changeable, the
electrophotographic photoreceptor includes an undercoat layer and a
photosensitive layer, and the undercoat layer includes a metal oxide
particle and an acceptor compound having a group capable of reacting with
the metal oxide particle.