Image Forming Apparatus

An image forming apparatus comprising:

• a casing;
• a plurality of photosensitive members arranged along an arrangement direction;
• and
• a plurality of developing cartridges each including a developer carrying member, the developer carrying member being configured to supply a developer to a corresponding one of the photosensitive members,
• wherein each photosensitive member is configured to move between an image formation position where an image is formed on the photosensitive member and a retracted position where the photosensitive member is retracted from the image formation position,
• wherein, when the photosensitive member is in the image formation position, the photosensitive member is configured to close a path through which a corresponding one of the developing cartridges is attached to and removed from the casing, and
• wherein, when the photosensitive member is in the retracted position, the photosensitive member is configured to open the path.