A disassembling method is disclosed for a process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus. The process cartridge includes covering members connected to a drum supporting frame and a developer container at ends of the drum supporting frame and the developer accommodating container with respect to a longitudinal direction of the electrophotographic photosensitive drum. The disassembling method includes a step of cutting the cover member adjacent to a connecting portion between the cover member and the drum supporting frame and a connecting portion between the cover member and the developer accommodating container along an outer wall of the covering member.