An object of the present invention is not caused the emission luminance decrease and pixel shrinkage, it is to provide an excellent organic EL display device in long-term reliability. The present invention provides an organic EL display device, an insulating layer (A) alkali-soluble resin formed on the first electrode, (B) o-quinonediazide compounds, a positive photosensitive resin composition comprising (C) an organic solvent a cured film obtained from the object, and a molar ratio S / C obtained when measuring the cross-section of the cured film is 0.003 or more 0.008, is an organic EL display device .