A light source unit 60 includes an excitation light source 70, a plurality of light sources 120, 300 at least one of which emits a light ray in a wavelength band different from that of the excitation light source, a plurality of collimator lenses 125, 305 which make light rays from the light sources into parallel ones, a luminous light emitting device 100 which receives the light ray from the excitation light source to emit a luminous light ray, a microlens array 254 which diffuses the light rays from the light sources to a predetermined range and distributes the luminance thereof uniformly within the predetermined range and a collective lens 255 which collects the light rays from the light sources which are emitted from the microlens array, and the light sources are disposed so that the light rays from the plurality of light sources intersect the light ray from the excitation light source at right angles.