PURPOSE: To obtain an inexpensive spectral distribution inspecting device which can calculate ultraviolet methamerism of a light source having an ultraviolet section emission energy such as fluorescent lamp handily, by measuring spectral distribution of a light source using two light receivers having peaks in the spectroscopic sensitivities respectively at ultraviolet section below 400nm and at the visible section above 400nm.

CONSTITUTION: Light from a light source passing through an interference filter 1 with a wavelength sensitivity for light in the ultraviolet section and an interference filter 3 with the wavelength sensitivity for light in the visible section are made incident into light receiving elements 2 and 4. The output signals of the elements are inputted into an arithmetic section 7 via an amplification parts 5 and 6 to calculate ratio or difference therebetween to be shown on a display section 8. Moreover, ultraviolet methamerism can be calculated from the data.