PURPOSE: To prevent flash generation on the outer surface of a final product even if the dislocation between the first and second nozzles is generated in the width direction by a method in which the second nozzle is overlapped on the front on the extrusion side of the first nozzle, a thin wall pieces which makes the opening width of the second nozzle narrower than the connection width of the first nozzle are formed in the opening fringe of the continuous opening of the second nozzle.

CONSTITUTION: The nozzle of an extrusion molding machine consists of the first nozzle 41 equipped with a main extrusion opening 40 and the second nozzle 43 equipped with a subordinate extrusion opening 42 and is arranged in an overlapped state in which the second nozzle 43 is closely contacted with the front on the extrusion side of the first nozzle 41. On the upper surface of a nozzle plate 47 formed in a subordinate extrusion opening 21, a connection opening 51 communicating with the opening 42 is formed from the front to the rear of the plate 47. A pair of thin wall pieces 53, 54 are installed extendingly in the opening fringe on both side in the width direction of the opening 51 so that the opening width of the opening 51 is made narrower than the narrowest part of the connection surface of the first nozzle 41.