Abstract: A light source apparatus for directing light from a light source into a plurality of optical fibers. The light source apparatus comprises a case which has an end, and the optical fibers are disposed at each end thereof and which encloses the light source. The case has on its inner wall a first group of ellipsoidal mirrors and a second group of ellipsoidal mirrors disposed symmetrically with respect to the light source. The light emitted from the light source is reflected by the first and second groups of ellipsoidal mirrors so as to be condensed on the end surfaces of the optical fibers to be outputted from the other end surfaces of the optical fibers. This arrangement can simultaneously offer a plurality of illumination sources and improve the efficiency of light condensation on the end surfaces of the optical fibers.