A spectroscopic measurement apparatus comprising: an optical system for dispersing measurement target light to form a spectral image; a photodetector including a light receiving surface on which a plurality of pixels are arranged respectively on a plurality of rows with the spectral image having a wavelength axis in a pixel arrangement direction of each of the plurality of rows being formed on the light receiving surface, and for receiving the spectral image for a first exposure time by a plurality of pixels arranged on one or a plurality of rows in a first region on the light receiving surface to output first spectrum data of the measurement target light, and receiving the spectral image for a second exposure time by a plurality of pixels arranged on one or a plurality of rows in a second region on the light receiving surface to output second spectrum data of the measurement target light; and an analysis unit for obtaining a spectrum of the measurement target light based on the first spectrum data and the second spectrum data, wherein the second exposure time is longer than the first exposure time, and when a wavelength band of the spectrum is divided into a saturation wavelength band including a wavelength band in which a value is at a saturation level or more in the second spectrum data and a non-saturation wavelength band other than the saturation wavelength band, the analysis unit obtains the spectrum of the measurement target light based on first partial spectrum data of the saturation wavelength band in the first spectrum data and second partial spectrum data of the non-saturation wavelength band in the second spectrum data. an optical system for dispersing measurement target light to form a spectral image; a photodetector including a light receiving surface on which a plurality of pixels are arranged respectively on a plurality of rows with the spectral image having a wavelength axis in a pixel arrangement direction of each of the plurality of rows being formed on the light receiving surface, and for receiving the spectral image for a first exposure time by a plurality of pixels arranged on one or a plurality of rows in a first region on the light receiving surface to output first spectrum data of the measurement target light, and receiving the spectral image for a second exposure time by a plurality of pixels arranged on one or a plurality of rows in a second region on the light receiving surface to output second spectrum data of the measurement target light; and an analysis unit for obtaining a spectrum of the measurement target light based on the first spectrum data and the second spectrum data, wherein the second exposure time is longer than the first exposure time, and when a wavelength band of the spectrum is divided into a saturation wavelength band including a wavelength band in which a value is at a saturation level or more in the second spectrum data and a non-saturation wavelength band other than the saturation wavelength band, the analysis unit obtains the spectrum of the measurement target light based on first partial spectrum data of the saturation wavelength band in the first spectrum data and second partial spectrum data of the non-saturation wavelength band in the second spectrum data.