Image Forming Apparatus

An image forming apparatus comprising:

• a main housing;
• a drum cartridge including a photosensitive drum;
• a developing cartridge configured to accommodate developer to be supplied to the photosensitive drum;
• and
• a drawer unit configured such that the drum cartridge and the developing cartridge are mounted thereon, the drawer unit being configured to move in a moving direction between an internal position at which the drawer unit is located inside the main housing and an external position at which the drawer unit is located outside the main housing, the drawer unit including:
• a drawer frame configured such that the drum cartridge and the developing cartridge are mounted thereon;
• and
• an exposure head configured to expose the photosensitive drum,
• in a state where the drawer frame is located at the external position and where the drum cartridge is mounted on the drawer frame, the drum cartridge being configured to rotatably move between:
• a first position at which the exposure head is located at a particular position relative to the photosensitive drum and the drum cartridge is prevented from being removed from the drawer frame;
• and
• a second position at which the exposure head is deviated from the particular position relative to the photosensitive drum and the drum cartridge is allowed to be removed from the drawer frame.