A cartridge that is mountable to an apparatus main assembly of an image forming apparatus, the apparatus main assembly having mounted a photosensitive drum separate from the cartridge, the cartridge comprising: a developing roller including an elastic layer for bearing developer (t), wherein the elastic layer can be pressured against the photosensitive drum; a frame supporting the developing roller; a movable part movably supported by the frame so as to be movable to a first position and to a second position relative to the frame and including a force receiving part; an elastic part provided between the frame and the movable part to urge the movable part; a drive input member for receiving input of rotational force to rotate the developing roller; and an urging member for urging the drive input member, wherein the force receiving part is suitable to receive an external force in a direction of moving the movable part from the first position to the second position so that, in a state that the cartridge is mounted on the apparatus main assembly, the elastic layer is pressured against the photosensitive drum, wherein, when the movable part receives force at the force receiving part and is at the second position, the movable part receives urging force from the elastic part, in a direction of moving the movable part from the second position to the first position, wherein an angle formed by a urging direction of the movable part by the elastic part, and a plane orthogonal to a urging direction of the drive input member by the urging member, is -45 degrees or greater and +45 degrees or smaller, wherein the movable part has another force receiving part that receives another external force in a direction of moving from the second position to the first position, wherein, in a state that the cartridge is mounted to the apparatus main assembly, the developing roller is capable of assuming a contact position in contact with the photosensitive drum when the movable part receives the force from the apparatus main assembly at the force receiving part and is at the second position and wherein, in a state that the cartridge is mounted to the apparatus main assembly, the developing roller is capable of assuming a spaced position spaced from the photosensitive drum and from the contact position when the movable part is at the first position and receives the another external force from the apparatus main assembly at the another force receiving part. a developing roller including an elastic layer for bearing developer (t), wherein the elastic layer can be pressured against the photosensitive drum; a frame supporting the developing roller; a movable part movably supported by the frame so as to be movable to a first position and to a second position relative to the frame and including a force receiving part; an elastic part provided between the frame and the movable part to urge the movable part; a drive input member for receiving input of rotational force to rotate the developing roller; and an urging member for urging the drive input member, wherein the force receiving part is suitable to receive an external force in a direction of moving the movable part from the first position to the second position so that, in a state that the cartridge is mounted on the apparatus main assembly, the elastic layer is pressured against the photosensitive drum, wherein, when the movable part receives force at the force receiving part and is at the second position, the movable part receives urging force from the elastic part, in a direction of moving the movable part from the second position to the first position, wherein an angle formed by a urging direction of the movable part by the elastic part, and a plane orthogonal to a urging direction of the drive input member by the urging member, is -45 degrees or greater and +45 degrees or smaller, wherein the movable part has another force receiving part that receives another external force in a direction of moving from the second position to the first position, wherein, in a state that the cartridge is mounted to the apparatus main assembly, the developing roller is capable of assuming a contact position in contact with the photosensitive drum when the movable part receives the force from the apparatus main assembly at the force receiving part and is at the second position and wherein, in a state that the cartridge is mounted to the apparatus main assembly, the developing roller is capable of assuming a spaced position spaced from the photosensitive drum and from the contact position when the movable part is at the first position and receives the another external force from the apparatus main assembly at the another force receiving part.