To improve external quality and commodity value of extruded products such as weather strips by excellently transfering patterns with only one embossing roll.

In a single embossing roll 30, a bottom wall 5 of a welt 3 in the weather strip 2 and a lip 6 of the bottom wall 5 are formed into a curved arc, and a peripheral face 34 formed into a curving arched recessed shape having the same curvature as the peripheral faces 7, 8 of the wall 5 and the lip 6 is provided. The embossing roll 30 is set to have 30 mm or more as a minimum radius r2 from a shaft center 35 to a bottom face 39 of the peripheral face 34. In the roll 30, a difference in dimension Y between a maximum radius r1 from the shaft center 35 to an end-part peripheral edge 37 of the peripheral face 34 and the minimum radius r2 is set to 20% or less to the dimension of the minimum radius r2.