PURPOSE: To hold the external surface beautifully and smoothly by enabling not only easy peeling-off of a protective tape but also reliable protection of the external surface, by covering the external surface with the protective tape adhering by charging statically.

CONSTITUTION: The titled manufacture is so constituted that a protective tape T is drawn out while the same is being made into contact with the inside in a piercing through-hole 12a of an extruding mold 12 or a piercing through-hole 13a of a shoe 13 in a sliding state and the tape T is pressed to weld to the external surface of a molding body M discharged through an extrusion mold 12 by making the tape T charge statically through sliding contact friction. The charge is generated large when tension is applied to the protective tape T to some extent within the piercing through- holes 12a, 13a or on this side of them and it follows that the protective tape T is stuck to the external surface of the molding body M by attracting the same. Sticking and covering of the protective tape T are completed prior to extrusion of the molding body M through an outlet of the extruding mold 12 or an outlet of the shoe 13, and when extrusion molding of the molding body M is performed in a predetermined cross-sectional form the external surface has been covered with the protective tape T already. The molding having gloss can be obtained easily in this manner.