The measuring system of measurement according to the present invention, using the first luminous intensity and the second luminous intensity, for collagen based on light includes: the light source (120) for issuing the light beam with source wavelength range； And optical system (130), to make the light polarization within the scope of source wavelength, to generate light beam (140), and light beam (140) to be guided to and be focused on target position below outer surface of the skin at the predetermined depth of focus, that skin (160) is internal. Measuring system further includes the first detector (150) and the second detector.
