The present invention relates to a nasal breathing device. Compared to a conventional nasal breathing device making a tongue attached to the palate by having a large volume, the nasal breathing device of the present invention makes a tongue naturally attached to a predetermined region of the palate by having a predetermined design. A k point is formed on a connection part of a tongue bottom surface and an oral cavity bottom surface, and thus a tongue is made to be maintained without being detached from the palate. A volume of the nasal breathing device is reduced, and thus pressure applied to a tongue is reduced. Thus, a tongue and a tongue root are moved to a front top side, and thus an upper airway is widened. Accordingly, a user can naturally breathe through his/her nose and perform abdominal respiration. According to the nasal breathing device of the present invention, both ends of an upper teeth contact surface are formed between a proximal core and a distal core of an upper jaw first premolar tooth. The end line of a palatine fold surface laterally connects the distal core of the upper jaw first premolar tooth. The both ends of a low teeth contact surface are formed by a lower jaw first premolar tooth. The both ends of a lower tongue gum surface are formed by a lower jaw second premolar tooth. The tongue bottom surface and the oral cavity bottom surface are concavely formed, and a K point is convexly formed on the center of the connection part between tongue bottom surface and the oral cavity bottom surface. A method for producing a nasal breathing device comprises: an impression model producing step a elastomeric interocclusal recording material producing step a stone model producing step a nasal breathing device shape designing step a stone model mounting step a nasal breathing device molding step and a nasal breathing device processing step.COPYRIGHT KIPO 2016본 발명은 이전 코숨장치가 부피를 크게 하여 혀를 입천장에 붙어있게 하였다면 코숨장치는 디자인에 의하여 혀가 자연스럽게 입천장 특정부위에 붙어있게 하며, 혀밑면과 구강저면 연결부
