Image forming apparatus and tandem type photosensitive unit

A tandem type photosensitive unit slidable to a drawn-out position and a mounted position with respect to an apparatus body of an image forming apparatus, comprising:

• a frame;
• a plurality of photosensitive bodies supported by the frame in a state parallelly arranged in a prescribed direction so that electrostatic latent images are formed thereon;
• a plurality of developer cartridges, including developer carriers opposed to the photosensitive bodies, detachably mountable on the frame;
• and
• a pressing portion provided on the frame for pressing each of the developer cartridges so that the developer carrier thereof is directed toward a corresponding one of the photosensitive bodies, wherein
• each of the developer cartridges is pivoted to be movable to an imaging position pressed by the pressing portion and a detached position released from the pressing by the pressing portion in the frame and detachable from the frame, and includes an abutted portion abutted by the apparatus body when the tandem type photosensitive unit is mounted on the apparatus body in a state where the developer cartridge is located on the detached position, and
• the developer cartridge located on the detached position is pivoted by being abutted by the apparatus body on the abutted portion to change an attitude thereof from the detached position to the imaging position when the tandem type photosensitive unit is mounted on the apparatus body.