An anesthetic tank which includes an insertion mouth for inserting an injection adapter attached to a mouth portion of an anesthetic container and a storage portion communicating with the insertion mouth, the storage portion being injected from the injection adapter inserted into the insertion mouth with a volatile anesthetic inside of the anesthetic container, comprising: an identifying member which: has a disk shape; is arranged on the outside of the insertion mouth and rotatable around the center axis of the insertion mouth; has an insertion hole formed in the position facing the insertion mouth, the insertion hole being used for inserting the injection adapter; and has a first identification portion formed in the internal surface of the insertion hole, the first identification portion being used for identifying the type of the volatile anesthetic to be injected in collaboration with a second identification portion formed in the injection adapter; and a cover member which has an opening formed in the position facing the insertion mouth and the insertion hole, the opening being used for inserting the injection adapter, and presses the peripheral part of the identifying member from above the identifying member, the identifying member accepting the injection adapter by rotating up to the position where the first identification portion engages with the second identification portion if the injection adapter having the second identification portion fit for the first identification portion is inserted into the insertion hole and thereby the second identification portion presses the first identification portion, and hindering insertion of the injection adapter by leading the first identification portion to block the space necessary for the insertion of the second identification portion if the injection adapter having the second identification portion unfit for the first identification portion is inserted into the insertion hole. an identifying member which: has a disk shape; is arranged on the outside of the insertion mouth and rotatable around the center axis of the insertion mouth; has an insertion hole formed in the position facing the insertion mouth, the insertion hole being used for inserting the injection adapter; and has a first identification portion formed in the internal surface of the insertion hole, the first identification portion being used for identifying the type of the volatile anesthetic to be injected in collaboration with a second identification portion formed in the injection adapter; and a cover member which has an opening formed in the position facing the insertion mouth and the insertion hole, the opening being used for inserting the injection adapter, and presses the peripheral part of the identifying member from above the identifying member, the identifying member accepting the injection adapter by rotating up to the position where the first identification portion engages with the second identification portion if the injection adapter having the second identification portion fit for the first identification portion is inserted into the insertion hole and thereby the second identification portion presses the first identification portion, and hindering insertion of the injection adapter by leading the first identification portion to block the space necessary for the insertion of the second identification portion if the injection adapter having the second identification portion unfit for the first identification portion is inserted into the insertion hole.