PURPOSE: To uniformly apply embossing to the design surface of an extrusion molded product whose design surface contains two surfaces having angles of inclination mutually different in the lateral direction thereof with good workability.

CONSTITUTION: A first embossing roll 7A embossing a first surface A1 and a second embossing roll 7B embossing a second surface A2 are arranged at positions where one of the roll ends is lapped each other in the lateral direction of the extrusion molded product extruded from an extruder on the boundary line 1 of the first and second surfaces A1, A2 so that an interval is provided therebetween in the feed direction of the extrusion molded product and the surfaces A1, A2 are successively embossed by the first and second embossing rolls 7A, 7B. The embossing rolls 7A, 7B are easily positioned as compared with a single roll simultaneously embossing two surfaces A1, A2 and uniform embossing can be applied. Embossed patterns are linearily lapped in the vicinity of the boundary line 1 but the appearance is not damaged.