A nasal cavity insertion device fixture, whereby the displacement or detachment of a nasal cavity insertion tube can be prevented during the sleep of a patient of sleep disorder, is provided. A nasal cavity insertion device fixture 100 according to the present invention makes contact with the inner surface of a nasal passage NH in order to fix a device 200 to be inserted into a nasal cavity. The nasal passage insertion device fixture 100 preferably includes a tubular contact portion that the outer peripheral surface thereof makes contact with the inner surface of the nasal passage NH. Further, the fixture 100 for the tubular nasal passage insertion device is preferably capable of accommodating the nasal cavity insertion tube 200 in the inside thereof.
