An image forming apparatus can easily attach or detach a plurality of
attachable and detachable units to or from the apparatus main body as a
single unit or individually. An intermediate transfer apparatus is
supported on a left guide rail and a right guide rail, and is attachable
to and detachable from the image forming apparatus main body. A cleaning
apparatus that cleans the intermediate transfer belt of the intermediate
transfer apparatus is supported by an upper rail and a lower rail so as
to be attachable to and detachable from the intermediate transfer
apparatus. The detachment direction of the intermediate transfer
apparatus and the direction of detachment of the cleaning apparatus are
configured to be the same.