The present invention provides an organic light-emitting device including a substrate and a plurality of organic light-emitting elements formed on the substrate, wherein the plurality of the organic light-emitting elements include a first organic light-emitting element which emits a light of a first emission color, and a second organic light-emitting element which emits a light of a second emission color different from the first emission color; each of the organic light-emitting elements has a first electrode having a light reflection layer and a transparent conductive layer, an organic compound layer containing a light-emitting layer, and a second electrode as a light extraction electrode, in mentioned order on the substrate; the light reflection layer of the first organic light-emitting element is formed between the substrate and the transparent conductive layer; the light reflection layer of the second organic light-emitting element is formed between the transparent conductive layer and the organic compound layer; and a thickness of the transparent conductive layer of the first organic light-emitting element is the same a thickness of the transparent conductive layer of the second organic light-emitting element.