An object of the present invention is to facilitate diagnosis in nasal cavity resistance measurement. In a state where both nostrils of a subject are covered with a mask, an air pressure P1 in one nostril is measured as anterior nasal pressure, and an air pressure P2 in the other nostril is measured as a posterior nasal pressure. The flow velocity F of the airflow passing through is measured. The nasal resistance is calculated based on the pressure difference between the atmospheric pressure P1 and the atmospheric pressure P2, and the flow rate F, and the pathology corresponding to the nasal resistance range is displayed on a graph in which the horizontal axis is the time axis and the vertical axis is the nasal resistance, By plotting the nasal resistance on each measurement day on the graph, the change in nasal resistance and disease state is shown. [Selection diagram] FIG.【課題】鼻腔抵抗測定における診断を容易化する。【解決手段】被験者の両方の鼻孔をマスクで覆った状態で、一方の鼻孔内の気圧Ｐ１を鼻腔前方圧として測定し、他方の鼻孔内の気圧Ｐ２を鼻腔後方圧として測定し、一方の鼻孔を通過する気流の流速Ｆを測定する。気圧Ｐ１と気圧Ｐ２との差圧と、流速Ｆに基づいて鼻腔抵抗を算出し、横軸を時間軸とし縦軸を鼻腔抵抗としたグラフに、鼻腔抵抗の範囲に対応した病状を表示し、そのグラフに各測定日の鼻腔抵抗をプロットすることで鼻腔抵抗と病状の推移を示す。【選択図】図５
