A spectroscopic measurement apparatus for measuring luminous efficiency of a measurement object which outputs up-conversion light by input of excitation light, the apparatus comprising: an integrator including an internal space in which the measurement object is disposed, a light input portion for inputting the excitation light from outside to the internal space, and a light output portion for outputting light from the internal space to the outside; a filter unit having a transmission spectrum in which an attenuation rate for the excitation light is larger than an attenuation rate for the up-conversion light, and configured to attenuate the light output from the light output portion in accordance with the transmission spectrum; a spectroscopic detector configured to disperse the light attenuated and output by the filter unit, and to acquire spectroscopic spectrum data; and an analysis unit configured to analyze the luminous efficiency of the measurement object on the basis of transmission spectrum data of the transmission spectrum of the filter unit and the spectroscopic spectrum data, wherein the filter unit includes a first filter for selectively attenuating the excitation light out of the excitation light and the up-conversion light, and a second filter for attenuating both the excitation light and the up-conversion light, the spectroscopic measurement apparatus being characterized in that: both the first filter and the second filter are configured to attenuate the light output from the light output portion, and the analysis unit is further configured to analyse the luminous efficiency of the measurement object on the basis of both a reference measurement performed in a state where the measurement object is not disposed in the internal space of the integrator and a sample measurement performed in a state where the measurement object is disposed in the internal space of the integrator, the filter unit being provided on an optical path between the integrator and the spectroscopic detector, and the excitation light and the up-conversion light output from the integrator being attenuated by the same filter unit and input to the spectroscopic detector. an integrator including an internal space in which the measurement object is disposed, a light input portion for inputting the excitation light from outside to the internal space, and a light output portion for outputting light from the internal space to the outside; a filter unit having a transmission spectrum in which an attenuation rate for the excitation light is larger than an attenuation rate for the up-conversion light, and configured to attenuate the light output from the light output portion in accordance with the transmission spectrum; a spectroscopic detector configured to disperse the light attenuated and output by the filter unit, and to acquire spectroscopic spectrum data; and an analysis unit configured to analyze the luminous efficiency of the measurement object on the basis of transmission spectrum data of the transmission spectrum of the filter unit and the spectroscopic spectrum data, wherein the filter unit includes a first filter for selectively attenuating the excitation light out of the excitation light and the up-conversion light, and a second filter for attenuating both the excitation light and the up-conversion light, the spectroscopic measurement apparatus being characterized in that: both the first filter and the second filter are configured to attenuate the light output from the light output portion, and the analysis unit is further configured to analyse the luminous efficiency of the measurement object on the basis of both a reference measurement performed in a state where the measurement object is not disposed in the internal space of the integrator and a sample measurement performed in a state where the measurement object is disposed in the internal space of the integrator, the filter unit being provided on an optical path between the integrator and the spectroscopic detector, and the excitation light and the up-conversion light output from the integrator being attenuated by the same filter unit and input to the spectroscopic detector. both the first filter and the second filter are configured to attenuate the light output from the light output portion, and the analysis unit is further configured to analyse the luminous efficiency of the measurement object on the basis of both a reference measurement performed in a state where the measurement object is not disposed in the internal space of the integrator and a sample measurement performed in a state where the measurement object is disposed in the internal space of the integrator, the filter unit being provided on an optical path between the integrator and the spectroscopic detector, and the excitation light and the up-conversion light output from the integrator being attenuated by the same filter unit and input to the spectroscopic detector.