Image forming apparatus

An image forming apparatus comprising:

• a main body housing having a space inside, the main body housing comprising:
• a front wall having an opening;
• and
• a rear wall, the front wall and the rear wall defining a space therebetween;
• a drum cartridge comprising a photosensitive drum and a guide, the drum cartridge being movable between an inner position where the drum cartridge is accommodated inside the space and an outer position where at least a part of the drum cartridge is drawn out of the space through the opening;
• a developing cartridge comprising a developing roller, the developing cartridge is detachably attachable to the guide on the drum cartridge;
• and
• a drawer movably supported by the main body housing,
• wherein the drum cartridge is detachably attachable to a first supporting position on the drawer,
• wherein the drawer moves the drum cartridge between the inner position and the outer position as the drawer moves with respect to the main body housing when the drum cartridge is attached to the first supporting position, and
• wherein a length of the drum cartridge in a movement direction that the drawer moves is shorter than a length of the developing cartridge in the movement direction.