A light rays radiation device for administering oral medical treatment to a person's gums that has a light ray radiating tool attachably and removably connected with the light ray emitting end-portion of an optical conductor cable through which the light rays corresponding to the visible light ray components of solar rays are transmitted to the light ray radiation tool. The light ray radiation tool has a mouthpiece having a transparent curved surface corresponding to the shape of the gums and a large number of optical fibers imbedded in the mouthpiece. The large number of optical fibers are constructed in such a manner that the end portions thereof are placed over the entire area of the transparent curved surface so as to be opposite the gum area and the other-side portions thereof are capable of being connected with the light ray emitting end portion of the optical conductor cable.
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