An inhalation mask, an artificial nose unit, an anesthetic gas concentration detector, an extension tube, an anesthesia attachment, and an elastic bag are in communicative connection in sequence. The elastic bag has a mixing chamber formed therein and has an anesthetic inlet, an air inlet, and an outlet port each formed at the boundary to the exterior. The anesthesia attachment includes a hollow structure and an evaporation injector syringe. The outlet port of the elastic bag is in communicative connection with the hollow structure through its opening, and the evaporation injector syringe tightly mates with the interior of another opening. In the evaporation injector syringe, a plunger presses a contractive bag in a syringe, so that an anesthetic in the contractive bag is injected into the mixing chamber through an extension nozzle and an injection needle provided to the tip thereof, the extension nozzle extending from a syringe nozzle being in communicative connection with the contractive bag to the outlet port. The anesthetic introduced from the tip of the injection needle being the anesthetic inlet into the mixing chamber is vaporized and then mixed with air introduced from the air inlet into mixed gas. The mixed gas is supplied from the outlet port to the inhalation mask by compressing the elastic bag or other procedures.
