Abstract: Provided is a coating apparatus that can thinly and evenly apply a coating liquid to a target surface of a separator film for lithium ion secondary batteries. Specifically, the coating apparatus includes a coating unit having a coating roll coating a target surface of a separator film fed in the vertical direction, and a pair of coating support rolls having a diameter smaller than that of first and second guide rolls, located between the first and second guide rolls, and closely and respectively located upstream and downstream of the coating roll in the film feed direction, wherein the coating support rolls push the surface of the film opposite to the target surface.