An image forming apparatus includes a main body and a cartridge attached to the main body. The cartridge includes: a casing extending in a longitudinal direction; a photosensitive drum extending in the longitudinal direction; and a separating member that is detachably attached to the casing. The photosensitive drum has a peripheral surface and is positioned in confrontation with the endless belt as a result of attachment of the cartridge to the main body. The separating member is attached to the casing and separates the photosensitive drum from the endless belt when the main body is packaged while the cartridge is attached to the main body. The separating member includes first and second end portions disposed on both end portions of the casing, and a connecting portion connecting the first and second end portions and is configured to cover the peripheral surface.