a process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus having a main assembly electrical contact , the process cartridge includes an electrophotographic photosensitive member ; process means actable on the photosensitive member ; a memory element for storing information relating to the cartridge ; a cartridge electrical contact electrically connectable to the main assembly electrical contact for transmitting the information from the memory element to the main assembly ; and a contact member including the cartridge electrical contact ; supporting means for supporting the contact member . the supporting means including a first regulating portion for regulating movement of the contact member in a widthwise direction , the first regulating portion being disposed with a gap therebetween ; a second regulating portion for regulating movement of the contact member in a thickness direction perpendicular to the widthwise direction , the second regulating portion being disposed with a gap therebetween ; and an opening for permitting insertion of the contact member into the supporting means , wherein the opening opens in one direction which is a direction of height and which is perpendicular to the widthwise direction and to the thickness direction , wherein the main assembly electrical contact includes a spring movable by a predetermined stroke in the thickness direction of the contact member , and the gap of the second regulating portion w 1 , a length w 2 of the contact member in the thickness direction , the stroke u satisfy , w 2 & lt ; w 1 , and & lt ; u .