Foamed molded body manufacturing method

A method for manufacturing a foamed molded body, wherein the foamed molded body has an expansion ratio of 2.0 or more;

• the method comprises a feeding step, a parison forming step, and a molding step;
• in the feeding step, raw material resin is fed into an internal space of a cylinder of an extruder through a hopper;
• in the parison forming step, a foamed parison is formed by extruding, from a head, a molten foaming agent-containing resin obtained by melt-kneading the raw material resin and a foaming agent in the internal space;
• in the molding step, the foamed parison is molded using a mold to form a foamed molded body;
• the raw material resin comprises 50 mass % or more of a polyethylene-based resin;
• the head comprises a die core and a die shell surrounding the die core;
• the foamed parison is formed by the foaming agent-containing resin flowing through a flow path between the die core and the die shell and being extruded from the head through an annular slit;
• in a tip area within a range of 20 mm in a vertical direction from the annular slit, the die core and the die shell have a die core side flow path forming surface and a die shell side flow path forming surface, respectively;
• and
• an angle between the die core side flow path forming surface and the die shell side flow path forming surface is 3.0 degrees or more.