An objective of the present invention is to provide a respiratory movement measuring device with which it is possible to segment and set regions to be evaluated simply and with good reproducibility, and to obtain a respiratory movement signal of each region. Provided is a respiratory movement measuring device which projects a light beam upon a body surface (32) of a subject (31), acquires light reflected therefrom with a camera (35), and measures the respiration of the subject. Marking sites which are guide locations are further set upon the body surface of the subject, and marks are assigned to the marking sites which have different degrees of reflectivity from the body surface. In an observation image, the body surface is segmented into a plurality of regions by segmenting lines which transect images of the marks, reflections of light points for each of the segmented regions are aggregated, and a respiratory movement signal is obtained.本發明將提供一種簡便且重現性佳而可分割設定欲評估的區域進而取得各區域之呼吸運動信號。本發明之解決手段:一種呼吸運動測定裝置係於被檢測者31之體表面32上照射一光束,利用照相機35取得其反射光來量測出被檢測者之呼吸量。於被檢測者之體表面上進一步設定有標誌位置之標記,於此等之標記上配置有一反射率不同於該體表面之指標,於觀察圖像上藉由通過該指標之成像之分割線將該體表面分割成複數個區域,再統計出被分割之各區域每個亮點之反射而取得呼吸運動信號。
