Image forming apparatus including first process cartridge and second process cartridge attachable to drawer at positions adjacent to each other

An image forming apparatus comprising:

• a housing having a front surface formed with an opening, the housing further having a rear surface opposite to the front surface in a front-rear direction of the housing;
• a drawer movable through the opening in the front-rear direction between:
• an inner position where the drawer is accommodated within the housing;
• and an outer position where a portion of the drawer is exposed to an outside of the housing;
• a first process cartridge attachable to and detachable from the drawer;
• and
• a second process cartridge attachable to and detachable from the drawer,
• the first process cartridge comprising a first drum cartridge and a first developing cartridge,
• the first drum cartridge comprising:
• a first photosensitive drum;
• and
• a first-drum-cartridge frame supporting the first photosensitive drum,
• the first developing cartridge being attachable to and detachable from the first-drum-cartridge frame and being configured to supply toner to the first photosensitive drum,
• the second process cartridge comprising a second drum cartridge and a second developing cartridge,
• the second drum cartridge comprising:
• a second photosensitive drum;
• and
• a second-drum-cartridge frame supporting the second photosensitive drum,
• the second developing cartridge being attachable to and detachable from the second-drum-cartridge frame and being configured to supply toner to the second photosensitive drum.