Foamed resin molded article and method for manufacturing same

A foamed resin molded vehicle door trim base comprising an olefin-based resin composition containing an elastomer having a reactive group, an olefin resin and a polyamide resin, wherein

• when a total of the elastomer having a reactive group, the olefin resin and polyamide resin contained in the olefin-based resin composition is taken as 100% by mass, a content of the elastomer having a reactive group is in a range of from 0.2 to 55% by mass, a content of the olefin resin is in a range of from 50 to 99.5% by mass, and a content the polyamide resin is in a range of from 0.3 to 60% by mass,
• the elastomer having a reactive group is at least one selected from maleic anhydride-modified ethylene-propylene copolymer, a maleic anhydride-modified ethylene-1-butene copolymer, a maleic anhydride-modified ethylene-1-hexene copolymer, a maleic anhydride-modified ethylene-1-octene copolymer, and a maleic anhydride-modified propylene-1-butene copolymer,
• the olefin resin is a polymer containing a structural unit derived from propylene,
• the polyamide resin is at least one selected from polyamide 11 and polyamide 12,
• the olefin-based resin composition has a continuous phase containing the olefin resin and a dispersed phase dispersed in the continuous phase and containing the polyamide resin,
• the dispersed phase contains a melt-kneaded product of the polyamide resin and the elastomer having a reactive group that reacts with the polyamide resin, and
• an expansion ratio of the foamed resin molded vehicle door trim base is 1.5 to 2.4 times.