A method for producing a foam-molded product by using a production apparatus including: a plasticizing cylinder which has a plasticization zone for plasticizing and melting a thermoplastic resin into a molten resin and a starvation zone for allowing the molten resin to be in a starved state, and which is formed having an introducing port for introducing a physical foaming agent into the starvation zone; and an introducing speed adjusting container which is connected to the introducing port, the method comprising: plasticizing and melting the thermoplastic resin to provide the molten resin in the plasticization zone; supplying a pressurized fluid containing the physical foaming agent having a fixed pressure into the introducing speed adjusting container and introducing the pressurized fluid having the fixed pressure from the introducing speed adjusting container into the starvation zone, thus retaining the starvation zone at the fixed pressure constantly during the production of the foam-molded product; allowing the molten resin to be in the starved state in the starvation zone; bringing the molten resin in the starved state in contact with the pressurized fluid in the starvation zone in a state in which the starvation zone 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, wherein a maximum value of an inner diameter of the introducing speed adjusting container is larger than an inner diameter of the introducing port, the introducing port is always open, and the starved state is a state in which an interior of the starvation zone is not filled with the molten resin and the interior of the starvation zone is unfilled. a plasticizing cylinder which has a plasticization zone for plasticizing and melting a thermoplastic resin into a molten resin and a starvation zone for allowing the molten resin to be in a starved state, and which is formed having an introducing port for introducing a physical foaming agent into the starvation zone; and an introducing speed adjusting container which is connected to the introducing port, the method comprising: plasticizing and melting the thermoplastic resin to provide the molten resin in the plasticization zone; supplying a pressurized fluid containing the physical foaming agent having a fixed pressure into the introducing speed adjusting container and introducing the pressurized fluid having the fixed pressure from the introducing speed adjusting container into the starvation zone, thus retaining the starvation zone at the fixed pressure constantly during the production of the foam-molded product; allowing the molten resin to be in the starved state in the starvation zone; bringing the molten resin in the starved state in contact with the pressurized fluid in the starvation zone in a state in which the starvation zone 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, plasticizing and melting the thermoplastic resin to provide the molten resin in the plasticization zone; supplying a pressurized fluid containing the physical foaming agent having a fixed pressure into the introducing speed adjusting container and introducing the pressurized fluid having the fixed pressure from the introducing speed adjusting container into the starvation zone, thus retaining the starvation zone at the fixed pressure constantly during the production of the foam-molded product; allowing the molten resin to be in the starved state in the starvation zone; bringing the molten resin in the starved state in contact with the pressurized fluid in the starvation zone in a state in which the starvation zone 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, wherein a maximum value of an inner diameter of the introducing speed adjusting container is larger than an inner diameter of the introducing port, the introducing port is always open, and the starved state is a state in which an interior of the starvation zone is not filled with the molten resin and the interior of the starvation zone is unfilled.