An object is to provide a fixture for preventing the displacement or the detachment of a device during the sleep of a patient of sleep disorder. A nasal cavity insertion device fixture (100L, 100L, 100L") includes a first contact part (111L) a second contact part (112L) disposed oppositely to the first contact part (111L) a coupling portion (113L) coupling the first contact part (111L) and the second contact part (112L), wherein the first contact part (111L) and the second contact part (112L) are configured to press a bridge of a nose from both sides to firmly fix the nasal insertion device fixture and prevent displacement or detachment of the device from the nose during use and a connecting part (120L) formed on the second contact part (112L) and configured to connect a nasal cavity insertion device to the second contact part (112L), the nasal cavity insertion device configured to be inserted into the pharynx via a nasal passage and to expand the pharynx.
