A process cartridge which can be detachably mounted in an image forming apparatus main body, the process cartridge comprising: a movable electrophotographic photosensitive member; a cleaning member which contacts with the surface of said electrophotographic photosensitive member and is adapted to remove a development agent from the surface of said electrophotographic photosensitive member; a housing portion for housing the development agent removed by said cleaning member; a sealing member which contacts with the surface of said electrophotographic photosensitive member upstream of said cleaning member in the direction of the movement of said electrophotographic photosensitive member and is adapted to allow the development agent on said electrophotographic photosensitive member to pass therethrough in the direction of the movement of said electrophotographic photosensitive member, while preventing the removed development agent from leaking out; a frame which includes said electrophotographic photosensitive member, said cleaning member, said housing portion and said sealing member; and a light passing portion provided in said frame for passing, therethrough, charge elimination light for eliminating charge from the surface of said electrophotographic photosensitive member, at a position downstream of a transfer position but upstream of the portion where said electrophotographic photosensitive member contacts with said sealing member, in the direction of the movement of said electrophotographic photosensitive member, wherein the difference between the work function of said electrophotographic photosensitive member and the work function of said sealing member is equal to or greater than 0.25 [eV], and said sealing member is made of an insulation material or is a conductive sealing member provided on an insulation bearing surface for adhering the sealing member thereon so as to be capable of maintaining electric charges caused by frictional electrification between said electrophotographic photosensitive member and said sealing member. a movable electrophotographic photosensitive member; a cleaning member which contacts with the surface of said electrophotographic photosensitive member and is adapted to remove a development agent from the surface of said electrophotographic photosensitive member; a housing portion for housing the development agent removed by said cleaning member; a sealing member which contacts with the surface of said electrophotographic photosensitive member upstream of said cleaning member in the direction of the movement of said electrophotographic photosensitive member and is adapted to allow the development agent on said electrophotographic photosensitive member to pass therethrough in the direction of the movement of said electrophotographic photosensitive member, while preventing the removed development agent from leaking out; a frame which includes said electrophotographic photosensitive member, said cleaning member, said housing portion and said sealing member; and a light passing portion provided in said frame for passing, therethrough, charge elimination light for eliminating charge from the surface of said electrophotographic photosensitive member, at a position downstream of a transfer position but upstream of the portion where said electrophotographic photosensitive member contacts with said sealing member, in the direction of the movement of said electrophotographic photosensitive member, wherein the difference between the work function of said electrophotographic photosensitive member and the work function of said sealing member is equal to or greater than 0.25 [eV], and said sealing member is made of an insulation material or is a conductive sealing member provided on an insulation bearing surface for adhering the sealing member thereon so as to be capable of maintaining electric charges caused by frictional electrification between said electrophotographic photosensitive member and said sealing member.