[Problem] To obtain a bright field image which can be easily and accurately overlaid on a Raman spectral image. [Solution] A subject (S) is irradiated with excitation light (L0), and the light emitted from the subject (S) due to the irradiation with the excitation light (L0) is spectroscopically measured by a spectrometer (12). The initial light intensity value of the excitation light wavelength from the light that has been emitted from the subject (S) and has entered the spectrometer (12) is adjusted at most 80% of the saturation light intensity of the spectrometer (12). When the light intensity of the excitation light wavelength that enters the spectrometer (12) has been adjusted, the irradiation position of the excitation light (L0) is two-dimensionally scanned, and a bright field image of the subject (S) is obtained from data for the excitation light wavelength of each spectrum measured while two-dimensionally scanning the excitation light (L0). A Raman spectral image of the subject (S) is obtained from Raman-scattered light peak wavelength data, and the bright field image and Raman spectral image are overlaid and displayed on a monitor (3).
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