A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, said main assembly including an output contact movable between an electrical connecting position and a retracted position retracted from the electrical connecting position, a displaceable member for moving the output contact, and an elastic function member for elastically urging the displaceable member to urge the output contact toward the retracted position away from the electrical connecting position, said process cartridge comprising: an electrophotographic photosensitive drum; process means actable on said electrophotographic photosensitive drum; and an input electrical contact for receiving a voltage for enabling said process means by engagement with the output contact moved to the electrical connecting position; said process cartridge being characterized by a movable operation member movable relative to a cartridge frame, said movable operation member being moveable from a position covering the input electrical contact to a position exposing the input electrical contact, and said movable operation member having a first engaging portion for engaging with a fixed engageable member fixed in the main assembly of the apparatus and a second engaging portion for engaging with a displaceable engaging portion of the displaceable member; wherein when said process cartridge is inserted into the main assembly of the apparatus, said movable operation member is engageable with the fixed engageable member fixed in the main assembly of the apparatus to move relative to the cartridge frame to the position exposing the input electrical contact, and is engageable with the displaceable engaging portion of the displaceable member to move the output contact from the retracted position to the electrical connecting position against an elastic force of the elastic function member, after the engagement with the fixed engageable member. an electrophotographic photosensitive drum; process means actable on said electrophotographic photosensitive drum; and an input electrical contact for receiving a voltage for enabling said process means by engagement with the output contact moved to the electrical connecting position; said process cartridge being characterized by a movable operation member movable relative to a cartridge frame, said movable operation member being moveable from a position covering the input electrical contact to a position exposing the input electrical contact, and said movable operation member having a first engaging portion for engaging with a fixed engageable member fixed in the main assembly of the apparatus and a second engaging portion for engaging with a displaceable engaging portion of the displaceable member; wherein when said process cartridge is inserted into the main assembly of the apparatus, said movable operation member is engageable with the fixed engageable member fixed in the main assembly of the apparatus to move relative to the cartridge frame to the position exposing the input electrical contact, and is engageable with the displaceable engaging portion of the displaceable member to move the output contact from the retracted position to the electrical connecting position against an elastic force of the elastic function member, after the engagement with the fixed engageable member.