This invention provides a nasal device comprising: a main body being tubular in shape having a hollow structure which extends from the end of front side to the end of rear side, wherein the main body is insertable into a nasal cavity； a front opening portion at the end of a front side of the main body and is configured to open the hollow structure towards the outside of the nasal device； a rear opening portion at the end of a rear side of the main body and is configured to open the hollow structure towards the outside of the nasal device； and a pressing portion placed at the rear end of the main structure and can move sideways from the rear end view in between a protruding position of the main body and an overlapping position that overlaps with the hollow structure.本發明提供一種鼻腔插入器，其係經由鼻腔於呼吸時使用之鼻腔插入器，其特徵係具有：本體部，係筒狀，於內部具有從前端側之端部延設至後端側之端部之中空部且能插入鼻腔中；前開口部，係前述本體部之前述前端側之端部開放前述中空部至外部；後開口部，係前述本體部之前述後端側之端部開放前述中空部至外部；及按壓部，係設置於前述本體部之前述後端側，並以從前述後端側視角可在往側向突出於前述本體部之突出位置及與前述中空部重疊之重疊位置之間移動。本發明之鼻腔插入器可容易插入鼻腔內，並可於插入鼻腔時經由鼻腔將充分量的空氣送入至呼吸道，且盡可能地防止從鼻腔脫落。
