Abstract: The light emitting device includes an organic electroluminescent element (20) and a diffractive optical element (30). The organic electroluminescent element (20) includes an anode layer (21), a cathode layer (22), and plural light emitting layers (231 and 232) interposed between the anode layer (21) and the cathode layer (22) and configured to emit light rays with different wavelengths. The diffractive optical element (30) is positioned in paths of light rays emitted from the organic electroluminescent element (20). The diffractive optical element (30) is designed to have different grating patterns (311 and 312) diffracting the light rays respectively emitted from the light emitting layers (231 and 232) for reducing chromatic aberration.