The present invention is characterized in having the structure which can reduce reflection ratio of exterior light when the device is not operating, that is, when light is not emitted from the device. To this end, the structural elements formed on the non-emitting areas are formed with dark color black matrix material. To have the structure, the present organic electroluminescent device comprises indium-tin-oxide (ITO) layers formed on a glass substrate; insulating layers formed on non-emitting area of the ITO layers, each insulating layer being formed with dark colored material; a plurality of walls formed on the insulating layers; and organic electroluminescence layers and metal layers formed sequentially on the entire structure including the walls, the organic electroluminescence layers and metal layers being separated from adjacent organic electroluminescence layers and metal layers by the walls. Each insulating layer is consisted of a black matrix film formed on the ITO layer and an insulating film formed on the black matrix film in the shape of wrapping the black matrix material layer. On the contrary, each insulating layer formed below the wall is consisted of an insulating layer formed on the ITO layer and a black matrix film formed on the insulating film. Also, in the present organic electroluminescent device, the walls can be formed with back matrix material.