a cartridge according to one aspect of the invention is detachably attachable to a main body including a first terminal . the cartridge comprises : a case ; a memory device configured to store information concerning the cartridge ; a cover member configured to cover a part of the case and movably supported on the case to allow a relative movement to the case ; and a second terminal provided at the cover member and electrically connected to the memory device . in a state where the cartridge is attached to the main body , the second terminal contacts with the first terminal of the main body .