An image forming apparatus includes a bearing member provided to a secondary transfer unit, with the bearing member being configured to engage with a main body unit of the apparatus, a hooking-receiving member rotatably provided in the main body unit of the apparatus and opposed to the bearing member, and a rotation regulation member provided to the main body unit of the apparatus to regulate rotation of the hooking-receiving member. The hooking-receiving member contacts the rotation regulation member when the secondary transfer unit is closed with respect to the main body unit of the apparatus and-rotates in a direction away from the rotation regulation member when the secondary transfer unit is opened with respect to the main body unit of the apparatus.