Process cartridge and image forming apparatus

A process cartridge comprising:

• a photosensitive drum;
• a gear that is attachable to an end of the photosensitive drum in a longitudinal direction of the photosensitive drum;
• a shaft member that is capable of passing through an inside of the photosensitive drum and the gear so as to extend in the longitudinal direction of the photosensitive drum;
• and
• a frame that has a pair of shaft supporting portions which supports both end portions of the shaft member at positions outside the photosensitive drum, one of the pair of shaft supporting portions functioning as a gear-side supporting portion which is provided on a side where the gear is disposed,
• wherein the gear includes a first insertion hole, into which the shaft member is inserted, and a projecting portion, which protrudes outward from a side, which is opposite to a side facing the end of the photosensitive drum, of the gear;
• wherein the gear-side supporting portion of the pair of shaft supporting portions includes a second insertion hole, into which the shaft member is inserted, and a positioning member, which is used to position the projecting portion at a predetermined position and inwardly protrudes from a surface, which faces the photosensitive drum, of the gear-side supporting portion in the longitudinal direction of the photosensitive drum;
• and
• the positioning member is arranged such that an opening of the first insertion hole and an opening of the second insertion hole overlap each other within a range in which the shaft member can be inserted thereto while the projecting portion is positioned at the predetermined position.