IMAGE FORMING APPARATUS CAPABLE OF MAKING TONER CARTRIDGE COMPLETELY ATTACHED TO DRUM CARTRIDGE DURING ATTACHMENT OF DRUM CARTRIDGE TO HOUSING

An image forming apparatus includes: a housing; drum cartridge attachable to the housing; a toner cartridge attachable to the drum cartridge at an attachment position; and a contacting portion positioned at a side wall of the housing positioned at one end thereof in a first direction. The drum cartridge includes a photosensitive drum and a drum frame. The toner cartridge includes a toner casing, a toner memory, a memory holder holding the toner memory, and a memory holder cover movably holding the memory holder. The memory holder cover has a protrusion protruding in a direction crossing the first direction. In a case where the drum cartridge is to be attached to the housing while the toner cartridge is lifted up from the drum frame than the attachment position, the protrusion is configured to contact the contacting portion to move the toner cartridge to the attachment position from the lifted-up position.