A light measurement device configured to measure measurement light generated by irradiating a sample with excitation light, the light measurement device comprising: a sample-container holding member (80, 80A, 80B, 80C) detachably attached to an integrator via a fixing member and holding a sample container comprising a cell containing a sample and a cap in a state where the sample container is placed in the integrator, the sample-container holding member (80, 80A, 80B, 80C) comprising: a support portion developing along an axial direction, the support portion being fixed to the fixing member; and a container attaching portion having a central axis and provided at an end of the support portion in the axial direction with the central axis inclined to the axial direction, and to which the sample container is attached, wherein the container attaching portion comprises: a housing portion housing the cap; and a holding portion formed of an elastic material, the holding portion having contact with at least three points on an outer surface of the cell and holding the sample container; the light measurement device further comprising a light generation unit configured to generate the excitation light along an optical axis, the integrator in which the sample container is placed, the integrator directing the excitation light to the cell along the optical axis direction; wherein the holding portion holds the sample container in a state where a longitudinal direction of the cell is along the central axis and inclined to one side or another side in the optical axis direction relative to a direction perpendicular to the optical axis direction. a sample-container holding member (80, 80A, 80B, 80C) detachably attached to an integrator via a fixing member and holding a sample container comprising a cell containing a sample and a cap in a state where the sample container is placed in the integrator, the sample-container holding member (80, 80A, 80B, 80C) comprising: a support portion developing along an axial direction, the support portion being fixed to the fixing member; and a container attaching portion having a central axis and provided at an end of the support portion in the axial direction with the central axis inclined to the axial direction, and to which the sample container is attached, wherein the container attaching portion comprises: a housing portion housing the cap; and a holding portion formed of an elastic material, the holding portion having contact with at least three points on an outer surface of the cell and holding the sample container; a support portion developing along an axial direction, the support portion being fixed to the fixing member; and a container attaching portion having a central axis and provided at an end of the support portion in the axial direction with the central axis inclined to the axial direction, and to which the sample container is attached, wherein the container attaching portion comprises: a housing portion housing the cap; and a holding portion formed of an elastic material, the holding portion having contact with at least three points on an outer surface of the cell and holding the sample container; a housing portion housing the cap; and a holding portion formed of an elastic material, the holding portion having contact with at least three points on an outer surface of the cell and holding the sample container; the light measurement device further comprising a light generation unit configured to generate the excitation light along an optical axis, the integrator in which the sample container is placed, the integrator directing the excitation light to the cell along the optical axis direction; wherein the holding portion holds the sample container in a state where a longitudinal direction of the cell is along the central axis and inclined to one side or another side in the optical axis direction relative to a direction perpendicular to the optical axis direction.