An image forming apparatus, including an image forming unit, a first frame, and a first beam, is provided. The image forming unit includes a photosensitive drum. The first frame is made of resin and is arranged on one end, along an axial direction of a rotation axis of the photosensitive drum, of the image forming unit. The first beam is formed in an elongated shape. The first beam is arranged along a planar face of the first frame. The first beam is fixed to the first frame by a fixing member at a first portion, which is in a position closer to a first longitudinal end of the first beam, and is loose from the first frame to be movable at least along the axial direction at a loose part, which is in a position closer to a second longitudinal end of the first beam than the first portion.