A method of forming coating by applying paint on the surface of a substrate by using a slit die coater ferrule having a paint ejecting slit formed therein, characterized in that the coating is formed to have a capillary number (Ca) and a dimensionless film pressure (X) obtained by (T/t) where a coating gap is (T) and a wet film pressure is (t) set so as to satisfy either of the following expressions, Ca <= 0.0651X-0.6669 (2) and Ca <= -0. 0005Ln (X) + 0.0108 (3).
