Abstract: A coating device for coating corrosion protection wax on a lower surface of a floor panel of a vehicle transferred by a conveyer comprises first robots for coating the wax on a first area formed within the lower surface at opposite peripheral portions to extend in a transfer direction in which the vehicle is transferred, and second robot for coating the wax on a second area formed within the lower surface of the floor panel to intervene between the first area. The first and second robot are arranged in serial in the transfer direction. The wax can be surely and uniformly coated on the first and second areas and coating work can be completed quickly.