A resonant cavity color conversion EL element in which intensity of converted light from a color conversion layer is increased and an organic EL display device in which viewing angle dependence of the color tone is small and the manufacturing process is simple. The EL element includes at least a pair of electrodes; a functional layer includes a light-emitting layer and is sandwiched by the pair of electrodes; a color conversion layer that absorbs light emitted from the light-emitting layer and emits light with a different wavelength; and a pair of light reflective layers. Notably, the pair of light reflective layers are composed of a non-transparent reflective layer and a semi-transparent reflective layer that have a distance therebetween that is set at an optical distance to construct a microcavity that increases intensity of light with a specific wavelength emitted from the color conversion layer.