A cartridge that is mountable to an apparatus main assembly of an image forming apparatus, the cartridge comprising: a developing roller; a frame (16, 34, 36, 46) supporting the developing roller; a drive input member (180, 280) for receiving input of rotational force to rotate the developing roller, a first movable part and a second movable part supported by the frame (16, 34, 36, 46) so as to be independently movable to a first position and to a second position relative to the frame (16, 34, 36, 46); and a first elastic part provided between the frame (16, 34, 36, 46) and the first movable part to urge the first movable part, and a second elastic part provided between the frame (16, 34, 36, 46) and the second movable part to urge the second movable part; wherein the first and second movable parts (70, 72) each include a force receiving part (70a, 72a) adapted to receive an external force from the apparatus main assembly in a direction of moving from the first position to the second position, wherein the first movable part is supported at a side of the frame (16, 34, 36, 46) at which the drive input member is disposed, and the second movable part is supported at a side of the frame (16, 34, 36, 46) at which the drive input member is not disposed, with respect to the rotational axis direction of the developing roller; characterized in that the cartridge is adapted such that, when the first and second movable parts (70, 72) receive the external forces at their force receiving parts (70a, 72a) and are at the second position, the first and second movable parts (70, 72) receive urging forces (F10, FH10) from the first and second elastic parts (71, 73) in a direction of moving the first and second movable parts (70, 72) from the second position to the first position, with the urging force of the first elastic part being smaller than the urging force of the second elastic part. a developing roller; a frame (16, 34, 36, 46) supporting the developing roller; a drive input member (180, 280) for receiving input of rotational force to rotate the developing roller, a first movable part and a second movable part supported by the frame (16, 34, 36, 46) so as to be independently movable to a first position and to a second position relative to the frame (16, 34, 36, 46); and a first elastic part provided between the frame (16, 34, 36, 46) and the first movable part to urge the first movable part, and a second elastic part provided between the frame (16, 34, 36, 46) and the second movable part to urge the second movable part; wherein the first and second movable parts (70, 72) each include a force receiving part (70a, 72a) adapted to receive an external force from the apparatus main assembly in a direction of moving from the first position to the second position, wherein the first movable part is supported at a side of the frame (16, 34, 36, 46) at which the drive input member is disposed, and the second movable part is supported at a side of the frame (16, 34, 36, 46) at which the drive input member is not disposed, with respect to the rotational axis direction of the developing roller; characterized in that the cartridge is adapted such that, when the first and second movable parts (70, 72) receive the external forces at their force receiving parts (70a, 72a) and are at the second position, the first and second movable parts (70, 72) receive urging forces (F10, FH10) from the first and second elastic parts (71, 73) in a direction of moving the first and second movable parts (70, 72) from the second position to the first position, with the urging force of the first elastic part being smaller than the urging force of the second elastic part.