An image forming apparatus, including a pair of resin-made main frames arranged to face each other along a first horizontal direction; a photosensitive member to carry an image in a developer agent thereon; an exposure device to expose the photosensitive member to light; a resin-made first auxiliary frame fixed to the main frames at one side along a second horizontal direction and configured to form a conveying path for the sheet; a second auxiliary frame to support the exposure device and fixed to the main frames at the other side along the second horizontal direction; and a swingable plate arranged in an intermediate position between the main frames with a lower surface thereof being exposed to outside, and swingably supported by lower end positions of the main frames on the other side along the second horizontal direction, is provided.