Abstract: First, second and third dichroic filters are positioned at corresponding ones of first, second and third light sources for deriving red, green and blue beams, respectively, from the light sources. A beam guide member has first, second and third branched bundles and a main bundle composed of the first, second and third branched bundles. Each branched bundle has an end surface at which a corresponding one of the beams derived from the dichroic filters is provided. The main bundle has an end surface for emitting the beams. A light quantity control circuit controls the quantities of light of the light sources.