There is provided an organic electroluminescence device including of a substrate, an anode layer, an organic layer including at least one organic material and a cathode layer. A primary light outgoing direction of the device is parallel to a surface of the substrate. Any one of cutoff wavelengths in a transverse electric mode of an optical waveguide having a core layer partially formed of the organic layer is within a wavelength range of a full width at half maximum of a fluorescence spectrum of any one of the organic materials included in the organic layer.