NOVELTY - The coating bar (1) has a cylindrical shaft which is drawn to spread the coating liquid (4) in a scraping manner on a substrate (3) which is to be coated with a thin film. Several grooves (2) are provided on a surface of the cylindrical shaft, where the groove size is smaller than the circumference of the cylindrical shaft in cross-section. A wire which is circular in cross-section, and a coating material which is partially covering the wire are provided in the grooves. A region is exposed from the coating material in a gap on the wire which serves as the groove.    USE - Coating bar of coating apparatus (claimed) used for applying coating liquid on substrate used in solar cell, display panel and lighting apparatus.    ADVANTAGE - The grooves are partially formed around the outer surface of the coating bar and are spaced at regular intervals, so as to cover the contact point between the coating bar and the substrate. Thus an overflow of coating liquid is prevented and a uniform coating film can be formed even on a curved or wavy rigid substrate having large width of about 300-2000 mm even in the case of coating bar with reduced diameter. The rigidity of the coating bar can be effectively reduced by optionally forming a hollow at the center of the shaft. The coating bar can easily track curves or waves in the width direction of the substrate by providing rubber in an orthogonal direction to the coating surface of the substrate. The winding of the wire and the formation of the resin are easier than the formation of grooves on the shaft, for easily applying a uniform film at low cost without causing uneven coating. Since the end of the groove or the gap is gradually decreased in depth, air bubbles present in coating liquid are easily released and the protrusion of the coating liquid is suppressed, for stably applying the uniform film.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a coating apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view illustrating shape of coating bar.    Coating bar (1)    Groove (2)    Substrate (3)    Coating liquid (4)    End of groove (5)