A cartridge configured detachably mountable to a main body of an image forming apparatus, the cartridge comprising: a first unit including an image bearing member and a first portion; a second unit including a developer bearing member and a second portion, and rotatably connected to the first unit, the second unit being configured to be movable relative to the first unit by rotating around a rotational axis between (i) a first position where the developer bearing member is in contact with the image bearing member and (ii) a second position where the developer bearing member is separated from the image bearing member and the second portion is in contact with the first portion, wherein the cartridge is configured to be removable from the main body in a state where the first unit takes a removal posture, wherein, in a state where the cartridge is removed from the main body and the first unit takes the removal posture, an own weight of the second unit, as to a center of gravity of the second unit, generates a moment around the rotational axis toward a direction, in which the second unit is moved toward the second position, such that the second unit is located at the second position by the own weight of the second unit, in a case where the second unit is located at the second position, movement of the second unit in a direction, in which the developer bearing member is separated from the image bearing member, is restricted by the second portion coming into contact with the first portion, and a distance between the rotational axis and the second portion in a direction orthogonal to the rotational axis is shorter than a distance between a rotation center of the developer bearing member and the rotational axis. a first unit including an image bearing member and a first portion; a second unit including a developer bearing member and a second portion, and rotatably connected to the first unit, the second unit being configured to be movable relative to the first unit by rotating around a rotational axis between (i) a first position where the developer bearing member is in contact with the image bearing member and (ii) a second position where the developer bearing member is separated from the image bearing member and the second portion is in contact with the first portion, wherein the cartridge is configured to be removable from the main body in a state where the first unit takes a removal posture, wherein, in a state where the cartridge is removed from the main body and the first unit takes the removal posture, an own weight of the second unit, as to a center of gravity of the second unit, generates a moment around the rotational axis toward a direction, in which the second unit is moved toward the second position, such that the second unit is located at the second position by the own weight of the second unit, in a case where the second unit is located at the second position, movement of the second unit in a direction, in which the developer bearing member is separated from the image bearing member, is restricted by the second portion coming into contact with the first portion, and a distance between the rotational axis and the second portion in a direction orthogonal to the rotational axis is shorter than a distance between a rotation center of the developer bearing member and the rotational axis.