A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus includes an electrophotographic photosensitive drum, a developing roller, a developer accommodator including two frames two end portion members, supporting the roller, a first member providing an electrostatic capacity between itself and the roller when a developing bias voltage is applied to the developing roller, and a second member including a contact portion elastically contacting to a bent portion of the accommodator, and a first electrical contact portion, electrically connected to the contact portion, for transmitting, to the main assembly, an electric signal corresponding to a value of the electrostatic capacity provided between the developing roller and the first member. The second member is mounted to one end portion member such that the contact portion is inside the one end portion member and the first electrical contact portion is outside the one end portion member.