The present invention provides a method for manufacturing a woody resin molded body which comprises a step of passing a woody resin composition containing a thermoplastic resin, a cellulose powder and a blowing agent, a weight ratio of the thermoplastic resin to the cellulose powder being from 20/80 to 80/20, through a shaping die that has no core body and extruding the woody resin composition into a cooling die. A barrel temperature of an extrusion molding machine is set lower than a foaming temperature of the blowing agent, and a temperature of the shaping die is set within a foaming temperature range of the blowing agent, to thereby obtain a woody resin molded body which has a high-expanded foam layer and a low-expanded foam layer formed on the outside of the high-expanded foam layer and in which the cellulose powder is not exposed on a surface of the low-expanded foam layer. In accordance with the present invention, a woody resin molded body is provided that is lightweight and similar to natural wood in secondary processability such as nail driving and screw tightening. The woody resin molded body is free from appearance defects such as streak patterns caused by the presence of weld lines on the surface, and strength problems such as surface cracking, excels in product rigidity and strength, and can be produced with good efficiency by extrusion molding.