In a coating apparatus(1) having an extrusion type coating head(2) so adapted as to form a coating on the surface of a support(4) by extruding a coating liquid continuously or successively from a slit(13), the slit(13) is tapered so as to expand or become wider gradually from its inlet end(13a) through which to allow the coating liquid to be extruded toward its outlet end(13b) through which to apply the coating liquid onto the surface of the support(4) and wherein an opening slit distance (d1) at the inlet end (13a) of the slit and an opening slit distance (d2) at the outlet end(13b) thereof satisfies the following relations: <MATH> The arrangement of the slit(13) can form a coating in a uniform film thickness by preventing an occurrence of irregularities or streaks on the surface of the coating or by suppressing a variation in film thickness. <IMAGE>
