PURPOSE: To stabilize a bead, by providing a means which moves a web from the bottom surface side of the bead to the top surface side thereof and pressurizes the bottom surface side of the bead and generating a pressure difference between the top and bottom surfaces of the bead.

CONSTITUTION: Coating liquid 6 is fed by a pump 18 and is advanced on the horizontal surface of a die block 3 by the effect of surface tension to form a bead 8 between the forward end of the block 3 and a web 1. A packing roll 2 is rotated in the direction of an arrow A and the web 1 is moved in the direction of an arrow A', that is, from the bottom surface side of the bead 8 toward the top surface side thereof to provide a pressurizing chamber 21 on the bottom surface side of the bead 8. Pressurizing air is fed by a blower 23 into said chamber 21 to generate a pressure difference between the top and bottom surface of the bead 8, whereby the bead is stabilized. The coating liquid of ≤2cp viscosity and ≤25dyne/cm surface tension is coated. This method is effective particularly in the case of coating the undercoating liquid (e.g., alcohol) for a photosensitive film.