The present invention provides a process cartridge mountable to an image forming apparatus, comprises an image bearing member, a conductive member arranged at one axial end of the image bearing member to contact with an electric contact of the image forming apparatus, thereby electrically earthing the image bearing member, and an opening member abutted against a laser light path blocking means of the image forming apparatus when the process cartridge is mounted to the image forming apparatus, thereby opening a laser light path. The opening member is arranged at the other axial end of the image bearing member remote from the conductive member.