the invention is directed to an electroluminescent display device in which a first planarization insulating film need not be used so that a manufacturing cost reduces , and a display defect caused by a cut in an organic el layer or moisture absorption at a step portion is prevented . an r color filter layer , a g color filter layer , and a b color filter layer are so formed that end portions of the adjacent r , g , and b color filter layers overlap each other . the r color filter layer , the g color filter layer , and the b color filter layer serve as a first planarization insulating film . for planarization , the end portions of the color filter layers overlap each other . for reducing a step height of an overlapping portion , the end portions of the color filters are formed in a tapered shape .