To provide configuration suitable for shipping or transportation in a state where a drum cartridge is attached to an image forming apparatus body in a compact color image forming apparatus.

The drum cartridge D is detachably attached to the electrophotographic image forming apparatus 1 having a supporting body 16 holding a plurality of developing devices 5a, 5b, 5c and 5d and rotating to convey the developing devices to a developing position successively, and provided to rock relative to the apparatus body 1A of the electrophotographic image forming apparatus 1. The drum cartridge D includes an electrophotographic photoreceptor drum 2, and separation members 100b and 100c provided to be detachable, and moving the supporting body 16 in a direction e where the supporting body 16 is separated from the electrophotographic photoreceptor drum 2 by abutting on the supporting body 16 when the drum cartridge D is attached to the apparatus body 1A.