To obtain a high luminance clear luminescence free from uneven coloring by utilizing exit light from a semiconductor light emitting element effectively.

The light source device 1 has a transparent semiconductor light emitting element 4. On the pattern 2a of a lead frame 21, transparent resin 3 mixed with a wavelength conversion material is formed with an area larger than that of the semiconductor light emitting element 4. The semiconductor light emitting element 4 is bonded onto the transparent resin 3. Light emitted from the rear surface 4a of the semiconductor light emitting element 4 is subjected to wavelength conversion by the wavelength conversion material in the transparent resin 3, and the light subjected to wavelength conversion is reflected on the pattern 2a of the lead frame 21. The reflected light is mixed with light emitted directly from the surface of the semiconductor light emitting element 4 and mixed light is radiated from the surface 4b of the semiconductor light emitting element 4.