An extrusion molding method for producing a foam-molded product by using: a plasticizing cylinder which has a plasticization zone for plasticizing and melting a thermoplastic resin into a molten resin and a starvation zone (43A or 43B) for allowing the molten resin to be in a starved state and which is formed with a corresponding introducing port (402A or 402B) for introducing a physical foaming agent into the starvation zone (43A or 43B), the method comprising: plasticizing and melting the thermoplastic resin to provide the molten resin in the plasticization zone; allowing the molten resin to be in the starved state in the starvation zone (43A or 43B); introducing a pressurized fluid containing the physical foaming agent having a fixed pressure into the starvation zone (43A or 43B) to retain the starvation zone (43A or 43B) at the fixed pressure; bringing the molten resin in the starved state in contact with the pressurized fluid containing the physical foaming agent having the fixed pressure in the starvation zone (43A or 43B) in a state in which the starvation zone (43A or 43B) is retained at the fixed pressure; and molding the molten resin having been brought in contact with the pressurized fluid containing the physical foaming agent into the foam-molded product, by extruding the molten resin from a die which is provided at the downstream end of the plasticizing cylinder into the atmospheric air, characterized in that the plasticizing cylinder has an introducing speed adjusting container (300A or 300B) connected to the corresponding introducing port (402A or 402B) and a volume of which is in a range of 5 mL to 10L; the method further comprises supplying the pressurized fluid containing the physical foaming agent to the introducing speed adjusting container (300A or 300B); and the pressurized fluid containing the physical foaming agent having the fixed pressure is introduced into the starvation zone (43A or 43B) from the introducing speed adjusting container (300A or 300B). plasticizing and melting the thermoplastic resin to provide the molten resin in the plasticization zone; allowing the molten resin to be in the starved state in the starvation zone (43A or 43B); introducing a pressurized fluid containing the physical foaming agent having a fixed pressure into the starvation zone (43A or 43B) to retain the starvation zone (43A or 43B) at the fixed pressure; bringing the molten resin in the starved state in contact with the pressurized fluid containing the physical foaming agent having the fixed pressure in the starvation zone (43A or 43B) in a state in which the starvation zone (43A or 43B) is retained at the fixed pressure; and molding the molten resin having been brought in contact with the pressurized fluid containing the physical foaming agent into the foam-molded product, by extruding the molten resin from a die which is provided at the downstream end of the plasticizing cylinder into the atmospheric air, characterized in that the plasticizing cylinder has an introducing speed adjusting container (300A or 300B) connected to the corresponding introducing port (402A or 402B) and a volume of which is in a range of 5 mL to 10L; the method further comprises supplying the pressurized fluid containing the physical foaming agent to the introducing speed adjusting container (300A or 300B); and the pressurized fluid containing the physical foaming agent having the fixed pressure is introduced into the starvation zone (43A or 43B) from the introducing speed adjusting container (300A or 300B).