A mouthpiece 15 is configured to be provided with a plurality of air nozzles 22 which are positioned around an admission port, and from which the air to enclose the surroundings of medicine powder flow discharged from the admission port 20 is blown off. Accordingly, when the breath is inhaled while an outer body 21 of the mouthpiece 15 is being held in the mouth, the air to be blown off from the air nozzles 22 forms an air curtain 24 to enclose the surroundings of the medicine powder flow 23 discharged from the admission port 20. Thereby, medicine powder included in the medicine powder flow 23 is prevented, by the air curtain 24, from adhering to the surface of the tongue, the internal surface of the oral cavity and the like. Thus, the medicine powder can be inhaled comfortably while unnecessary taste of the medicine powder such as sweetness, saltiness, sourness, bitterness and the like, is not being sensed.