PURPOSE: To provide a method for manufacturing an extrusion molded form having excellent surface adhesive performance which can stably mold an extrusion molded form made of crosslinking resin.

CONSTITUTION: An extruding apparatus having an extruder 11 and a long land die 13 having a resin channel coupled to the extruder therein is used. Resin composition containing crosslinking resin and crosslinking agent having higher decomposing temperature than a softening point of the crosslinking resin is melted by the extruder 11. The molten composition is supplied to a resin channel of the die 13, and passed to be crosslinked while supplying lubricant in the resin channel in the die in the entire periphery. As a lubricant, lubricant having 1-50,000cps of melt viscosity at 130-250°C and a melting point or a softening point of a molding temperature or lower of the crosslinking resin and formed of copolymer of modified polyethylene or ethylene and monomer having a polarizable group is used.