The invention provides a spectroscopic measurement apparatus which can reduce measurement errors generated by bending of optical fibers and improve the light amount of light supplied to a spectroscopic measurement unit. The spectroscopic measurement device is provided with: a spectroscopic measurement unit that performs spectroscopic measurement on incident light through a slit; and a light diffusion unit for diffusing light supplied from the plurality of optical fibers. Physical fixation relative to the slit is realized in a manner that diffused light is directly emitted into or emitted intothe slit through a lens or a reflector.