An insulation film for organic electroluminescence devices which is formed by heating a resist film having a desired pattern and formed with a composition which comprises (A) a resin soluble in an alkali, (B) an ester of a quinonediazidesulfonic acid, (C) a thermosetting component which is curable at a temperature higher than a temperature of heat resistance of a resist film formed with the composition in accordance with photolithography, and an organic solvent, on a substrate in accordance with photolithography, has a sectional shape having upper edge portions having a round shape and a width increasing towards a bottom portion and has a thickness in a range of 0.3 to 3 μm.