a cartridge which may include a housing , a driving input member provided at the housing wherein the driving input member is configured to be rotated by an externally supplied rotation driving force , and a rotational member configured to receive the rotation driving force , which is transmitted from the driving input member , and be rotated thereby . the cartridge may also include a detection protrusion provided at a position away from a rotational center of the rotational member . the detection protrusion may include a main body protruding from the rotational member away from the housing and a pivot part configured to pivot relative to the main body . the detection protrusion may be configured to be changeable between an extended state and a collapsed state with respect to the rotational member .