PURPOSE: To attain uniform and smooth beautiful coating independently of the kind of a coating liquid and a material to be coated and to build up a coating means facilitating a film thickness control easily.

CONSTITUTION: In curtain flow coating where a curtain of the coating fluid formed by allowing it to flow down on a running belt like material from a slit formed nozzle is continuously coated, the coating is performed while an auxiliary curtain 25 of liquid insoluble to the coating liquid being laid over the side to be an upper surface of a coating film of the curtain 24 of the prescribed coating liquid is formed, or further the coating is performed while the auxiliary curtain 25 is heated by a heating means.