A cartridge including a housing configured to accommodate developer, a driving receiving part configured to receive a driving force, a rotary member configured to rotate by being transmitted the driving force from the driving receiving part, a detected member including a detected part and configured to move in an axis direction parallel with a rotational axis of the rotary member by being transmitted the driving force from the rotary member, a support part rotatably supporting the rotary member and moveably supporting the detected member in the axis direction, and a guide part provided at a position different from the support part and configured to guide movement of the detected member in the axis direction by contacting the detected member.