A process cartridge is mounted to or demounted from a movable member which is retractable in a horizontal direction to mount the process cartridge to the main assembly or to demount the process cartridge from the main assembly, and includes: an electrophotographic photosensitive member; a cleaning member for removing toner from the electrophotographic photosensitive member; a toner feeding portion for feeding by a toner feeding member toner removed from the electrophotographic photosensitive member by the cleaning member; a cartridge frame supporting at least the electrophotographic photosensitive member; a first projection projecting outwardly substantially coaxially with the electrophotographic photosensitive member, provided on one end surface of the cartridge frame; a third projection projecting outwardly at a position upstream of the first projection; a second projection projected outwardly substantially coaxially with the first projection, provided on the other end surface; and a fourth projection projected outwardly substantially coaxially with the third projection.