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.
