Each of an inhalation mask, an artificial nose unit, an anesthetic gas concentration-detecting device, an extension tube, an anesthetic attachment, and an elastic bag are communicably connected in said order. The elastic bag has a mixing chamber therein and, between the bag and the outside thereof, is provided with an anesthetic introduction port, an external air introduction port, and a discharge port. The anesthetic attachment comprises a hollow structure and a vaporization injector syringe. The elastic bag is communicably connected from the discharge port to the hollow structure via one of the openings thereof and the vaporization injector syringe is tightly fitted into a different opening. The vaporization injector syringe passes an anesthetic in a contracting bag inside the syringe into an extension nozzle, which extends from a syringe nozzle that is communicably connected to the contracting bag to the discharge port, and into an injection needle on the tip of the extension nozzle and injects the anesthetic into the mixing chamber by pressing the contracting bag with the plunger. The anesthetic, which has been introduced into the mixing chamber from the tip of the injection needle that serves as the anesthetic introduction port, is vaporized and is mixed with external air that has been introduced from the external air introduction port to generate a mixed gas. The mixed gas is delivered to the inhalation mask from the discharge port by compression of the elastic bag, etc.Selon linvention, chacun parmi un masque dinhalation, une unité de nez artificiel, un dispositif de détection de concentration de gaz anesthésique, un tube dextension, une attache anesthésique et un sac élastique sont reliés en communication dans ledit ordre. Le sac élastique a une chambre de mélange dans celui-ci et comporte, entre le sac et lextérieur de celui-ci, un orifice dintroduction danesthésique, un orifice dintroduction dair externe et un orifice dévacuation. Lattache danesthésique co
