An optical measurement device for irradiating a sample with excitation light and detecting measurement light, the optical measurement device comprising: a first correction member, a second correction member, a sample holder, a light source for providing the excitation light; a light integrator in which the sample is configured to be disposed; an optical system for irradiating the sample in the light integrator with the excitation light having a predetermined beam cross-section; a photodetector for detecting measurement light output from the light integrator and outputting intensity data at least one wavelength; a storage unit in which correction data is stored; and an optical characteristic calculation unit for calculating optical characteristics of the sample based on the intensity data and the correction data, the optical measurement device further comprising a first light absorbing member and a second light absorbing member; wherein the correction data (α) is a correction value calculated based on first corrective intensity data, which is a detection value from the photodetector of first measurement light output from the light integrator when the first light absorbing member disposed in the light integrator is irradiated with the excitation light having the predetermined beam cross-section, on second corrective intensity data, which is a detection value from the photodetector of second measurement light output from the light integrator when the second light absorbing member disposed in the light integrator is irradiated with the excitation light having the predetermined beam cross-section, on first reference intensity data, which is a detection value of first measurement light output from the light integrator when the first correction member, placed on the sample holder, in the absence of the first light absorbing member, is irradiated with the excitation light having the predetermined beam cross-section, and on second reference intensity data, which is a detection value of second measurement light output from the light integrator when the second correction member, placed on a sample holder, in the absence of the second light absorbing member, is irradiated with the excitation light having the predetermined beam cross-section, and wherein the predetermined beam cross-section of the excitation light is covered by the first light absorbing member and covers the second light absorbing member in such a way that the area of the predetermined beam cross-section of the excitation light is smaller than the area of the first light absorbing member and larger than the area of the second light absorbing member. a light integrator in which the sample is configured to be disposed; an optical system for irradiating the sample in the light integrator with the excitation light having a predetermined beam cross-section; a photodetector for detecting measurement light output from the light integrator and outputting intensity data at least one wavelength; a storage unit in which correction data is stored; and an optical characteristic calculation unit for calculating optical characteristics of the sample based on the intensity data and the correction data, the optical measurement device further comprising a first light absorbing member and a second light absorbing member; wherein the correction data (α) is a correction value calculated based on first corrective intensity data, which is a detection value from the photodetector of first measurement light output from the light integrator when the first light absorbing member disposed in the light integrator is irradiated with the excitation light having the predetermined beam cross-section, on second corrective intensity data, which is a detection value from the photodetector of second measurement light output from the light integrator when the second light absorbing member disposed in the light integrator is irradiated with the excitation light having the predetermined beam cross-section, on first reference intensity data, which is a detection value of first measurement light output from the light integrator when the first correction member, placed on the sample holder, in the absence of the first light absorbing member, is irradiated with the excitation light having the predetermined beam cross-section, and on second reference intensity data, which is a detection value of second measurement light output from the light integrator when the second correction member, placed on a sample holder, in the absence of the second light absorbing member, is irradiated with the excitation light having the predetermined beam cross-section, and wherein the predetermined beam cross-section of the excitation light is covered by the first light absorbing member and covers the second light absorbing member in such a way that the area of the predetermined beam cross-section of the excitation light is smaller than the area of the first light absorbing member and larger than the area of the second light absorbing member.