Provided is an image forming apparatus including: an apparatus main body; an intermediate transfer unit; and an image-bearing-member unit. the intermediate transfer unit includes an intermediate transfer belt, a frame, a drive roller, a tension roller, a transfer roller that is movable between a transfer position and a retractive position. The frame includes a first protrusion. The image-bearing-member unit includes an image bearing member, and a first regulating guide that extends in an axial direction of the image bearing member, and that faces the first protrusion in the upper-and-lower direction. The intermediate transfer belt and the image bearing member face each other with a predetermined length therebetween under a state in which the first protrusion and the first regulating guide are held in contact with each other, and in which the transfer roller has come to the retractive position.