The objective of the invention is to appropriately detect a pulse wave even when the luminance changes due to a subject moving relative to lighting. When a face moves closer to a camera or a lighting device, the luminance becomes higher while the surface area of the face becomes larger. Conversely, when the face moves away from the camera or lighting device, the luminance becomes lower while the surface area of the face also becomes smaller. Since the luminance and the size of the face have such a correlation, this pulse wave detection device (1) detects the face from a frame image and corrects the luminance of the face on the basis of the size of the face. As the luminance of the face depends on the distance between the lighting and the face, this results in the distance from the lighting to the face being measured indirectly by the size of the face. In this way, the pulse wave detection device (1) uses the correlation between the change in luminance and the size of the face of the subject in the frame image to correct the magnitude of the luminance of the face pictured in the frame image by the size of the face, and then, from the post-correction luminance signal, estimates/measures the pulse rate of the subject.