Provided is a light emission device including: first and second light emission element regions; first to fourth reflection interfaces; a light extraction plane; and first and second light emission layers. The first reflection interface is provided in the first and second light emission element regions. The light extraction plane is provided in confronted relation to the first reflection plane. The second reflection interface allows reflection therefrom to cause reinforcement with respect to center wavelengths of light emission spectra of the first and second light emission layers. The third and fourth reflection interfaces allow reflection therefrom to cause attenuation with respect to the center wavelength of the light emission spectrum of the first light emission layer, and to cause reinforcement with respect to the center wavelength of the light emission spectrum of the second light emission layer.