An anesthetic tank includes an insertion mouth for inserting an injection adapter of an anesthetic container, and a storage portion communicating with the insertion mouth. A volatile anesthetic inside of the anesthetic container is injected into the storage portion. An identifying member is arranged on the outside of the insertion mouth and is rotatable around the center axis of the insertion mouth. The identifying member has key groove formed in the internal surface of an insertion hole for inserting the injection adapter. The key groove are used for identifying the type of the volatile anesthetic in collaboration with keys formed in the injection adapter. A cover member has an opening formed in the position facing the insertion mouth and the insertion hole and presses the peripheral part of the identifying member.
