A color display device comprising a plurality of pixels on a substrate, wherein each pixel comprises a plurality of sub-pixels, each sub-pixel emits light of different wavelengths in the visible range and further comprises a white sub-pixel, wherein the plurality of sub-pixels and the white sub-pixel each have a white organic electroluminescence layer sandwiched between an upper electrode and a transparent electrode and being interposed between an optically semitransparent reflection layer and a light reflection layer (12-1, 12-2), the optical distance between the optically semitransparent reflection layer and the light reflection layer in each of the plurality of sub-pixels forms a resonator having a distance for resonating emitted light, wherein the plurality of sub-pixels comprise a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the optical distances between the optically semitransparent reflection layer and the light reflection layer in the red sub-pixel, green sub-pixel and blue sub-pixel are distances with which red light, green light and blue light are resonated respectively, wherein the optical distance between the optically semitransparent reflection layer and the light reflection layer in the white sub-pixel is longer than the maximum optical distance between the optically semitransparent reflection layer and the light reflection layer in each of the plurality of sub-pixels, wherein the substrate is provided with a TFT connected to the transparent electrode and has a planarizing film thereon, and at least one of the sub-pixels has a planarizing film on the substrate and has the light reflection layer on the planarizing film, and wherein the red sub-pixel, green sub-pixel and blue sub-pixel each have, on the planarizing film, the light reflection layer, the optically semitransparent reflection layer and an optical path length regulation layer (18-1, 18-2, 18-3) and the white organic electroluminescence layer interposed between the optically semitransparent reflection layer and the light reflection layer, and characterized in that the white sub-pixel has the light reflection layer between the substrate and the planarizing film and has, on the planarizing film, the transparent electrode, the white organic electroluminescence layer, and the optically semitransparent reflection layer. wherein the plurality of sub-pixels and the white sub-pixel each have a white organic electroluminescence layer sandwiched between an upper electrode and a transparent electrode and being interposed between an optically semitransparent reflection layer and a light reflection layer (12-1, 12-2), the optical distance between the optically semitransparent reflection layer and the light reflection layer in each of the plurality of sub-pixels forms a resonator having a distance for resonating emitted light, wherein the plurality of sub-pixels comprise a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the optical distances between the optically semitransparent reflection layer and the light reflection layer in the red sub-pixel, green sub-pixel and blue sub-pixel are distances with which red light, green light and blue light are resonated respectively, wherein the optical distance between the optically semitransparent reflection layer and the light reflection layer in the white sub-pixel is longer than the maximum optical distance between the optically semitransparent reflection layer and the light reflection layer in each of the plurality of sub-pixels, wherein the substrate is provided with a TFT connected to the transparent electrode and has a planarizing film thereon, and at least one of the sub-pixels has a planarizing film on the substrate and has the light reflection layer on the planarizing film, and wherein the red sub-pixel, green sub-pixel and blue sub-pixel each have, on the planarizing film, the light reflection layer, the optically semitransparent reflection layer and an optical path length regulation layer (18-1, 18-2, 18-3) and the white organic electroluminescence layer interposed between the optically semitransparent reflection layer and the light reflection layer, and characterized in that the white sub-pixel has the light reflection layer between the substrate and the planarizing film and has, on the planarizing film, the transparent electrode, the white organic electroluminescence layer, and the optically semitransparent reflection layer.