An outer lip 26 is forked into an inner-attaching lip 26X and an outer-attaching lip 26Y, wherein the outer-attaching lip 26Y is set on a position where a top end 26a thereof is not drawn toward a connecting wall 24 side by the door glass 9; a folding point 60 is formed on a connecting wall 24 side of a base root 26d of the inner-attaching lip 26X for turning the inner-attaching lip 26X toward the connecting wall 24 side; thickness 31 of the base root 26d of the inner-attaching lip 26X is thicker than thickness 32 on the folding point 60 and thickness 34 of the base root 26b of the outer-attaching lip 26Y is thinner than thickness 33 of the top end 26a; and the outer-attaching lip 26Y follows turn of the inner-attaching lip 26X and is slidably brought into contact with the door glass 9.