Abstract: A light-ray therapeutic apparatus having: a xenon illuminating lamp including a lamp body, a lamp holder provided in the lamp body, a xenon lamp held by the lamp holder, a reflecting mirror for reflecting light emitted from the xenon lamp, and a multilayer film coating-type spectral correction filter provided in a front portion of the lamp body; wherein, of the light from the xenon lamp, energy of ultraviolet rays having a wavelength not longer than 280 nm is cut off by the spectral correction filter, and spectral coincidence in an ultraviolet wavelength range of 280-400 nm, in a visible wavelength range of 380-780 nm, and in an infrared wavelength range of 780-2,500 nm are made 100±30% respectively, while the spectral coincidence is defined as a ratio of relative energy distribution of the light of the xenon lamp to relative energy distribution of the reference sunlight.