A method for producing a foam-molded product by using: a plasticizing cylinder (210, 410) which has a plasticization zone (21, 41) for plasticizing and melting a thermoplastic resin into a molten resin and a starvation zone (23, 43A, 43B) for allowing the molten resin to be in a starved state and which is formed with an introducing port (202, 402A, 402B) for introducing a physical foaming agent into the starvation zone (23, 43A, 43B), the method comprising: plasticizing and melting the thermoplastic resin to provide the molten resin in the plasticization zone (21, 41); allowing the molten resin to be in the starved state in the starvation zone (23, 43A, 43B); introducing a pressurized fluid containing the physical foaming agent having a fixed pressure into the starvation zone (23, 43A, 43B) to retain the starvation zone (23, 43A, 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 (23, 43A, 43B) in a state in which the starvation zone (23, 43A, 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, characterized in that the plasticizing cylinder (210, 410) has an introducing speed adjusting container (300, 300A, 300B) which is connected to the introducing port (202, 402A. 402B) and a volume of which is in a range of 5 mL to 10L; wherein the method further comprises supplying the pressurized fluid containing the physical foaming agent to the introducing speed adjusting container (300, 300A, 300B); and the pressurized fluid containing the physical foaming agent having the fixed pressure is introduced into the starvation zone (23, 43A, 43B) from the introducing speed adjusting container (300, 300A, 300B). plasticizing and melting the thermoplastic resin to provide the molten resin in the plasticization zone (21, 41); allowing the molten resin to be in the starved state in the starvation zone (23, 43A, 43B); introducing a pressurized fluid containing the physical foaming agent having a fixed pressure into the starvation zone (23, 43A, 43B) to retain the starvation zone (23, 43A, 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 (23, 43A, 43B) in a state in which the starvation zone (23, 43A, 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, the plasticizing cylinder (210, 410) has an introducing speed adjusting container (300, 300A, 300B) which is connected to the introducing port (202, 402A. 402B) and a volume of which is in a range of 5 mL to 10L; wherein the method further comprises supplying the pressurized fluid containing the physical foaming agent to the introducing speed adjusting container (300, 300A, 300B); and the pressurized fluid containing the physical foaming agent having the fixed pressure is introduced into the starvation zone (23, 43A, 43B) from the introducing speed adjusting container (300, 300A, 300B).