PURPOSE: To provide a jig adaptable to plural photoreceptor drums with a simple structure by forming this jig into a shape tapered in part in contact with the inside of the photoreceptor drums at the time of fitting, the shape of the part inside the drum and the extension line toward the outside of the drums.

CONSTITUTION: This jig for holding a photoreceptor drums corresponds continuously to the photoreceptor drums of different bores by preparing a holding jig 2 having a tapered shape meeting the differences in the bores of drum-shaped substrates. Namely, the holding jig 2 has a recessed part 1 of the holding jig 1 fittable to the projecting part of the drum photoreceptor having a projecting shape at the front end. The holding jig has a part 3 for holding the 30 drum- shaped photoreceptor. Similarly, the jig has a part holding the 60 drum-shaped photoreceptor and parts 4, 5 for holding the 120 drum-shaped photoreceptor. Then, the substrates of the drum photoreceptors consisting of various kinds of the bores are held by one jig 2.