Disclosed is a PTFE resin composition comprising 70 to 90 wt. The pretreatment agents for hair colorings with acid dye are used for improving coloring ability and color fastness of hair colorings with acid dye. A first outermost lamination defines a first supporting surface, and a second outermost lamination defines a second supporting surface on which the front and rear casings are supported. The projecting patterns are formed by using a self-organized layer made of a block copolymer having at least two of polymer chains.