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.
