PROBLEM TO BE SOLVED: To measure an intensity of Raman peak with a known distribution wavelength while eliminating fluorescent light without using a spectrometer and with a simple configuration.SOLUTION: A Raman scattered light measuring method uses: wavelength selection means (c1) for irradiating a measuring object 10 with an excitation laser beam having a narrow line width and selecting light in a specific wavelength region from radiation light emitted from the measuring object; and a detector e1 for measuring an intensity of light. The measuring method performs: one measurement of irradiating the measuring object with an excitation laser beam a1 so as to allow the wavelength selection means to select at least a part of a Raman peak r3, and measuring an intensity of light d1 selected by the wavelength selection means with the detector; and other measurement of irradiating the measuring object with an excitation laser beam a2 that is wavelength-shifted from the excitation laser beam at the one measurement so that a selected amount of the Raman peak by the wavelength selection means is different from that at the one measurement and measuring an intensity of light d2 selected by the wavelength selection means with the detector. A difference between measured values obtained at the one measurement and the other measurement is calculated as a Raman peak intensity.
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