A polypropylene-based foamed molded body, wherein a density which is measured on the basis of ISO1183 is greater than or equal to 0.15 g/cm 3 and less than or equal to 0.54 g/cm 3, thermal resistance at 30°C in a thickness direction which is measured on the basis of ASTM E1530 is greater than or equal to 0.020 m 2 ·K/W and less than or equal to 0.125 m 2 ·K/W, thermal capacity per unit area at 30°C is greater than or equal to 1.0 kJ/m 2 ·K and less than or equal to 2.5 kJ/m 2 ·K, Expression 1 described below is satisfied, and a substantial thickness (t 0) of the polypropylene-based foamed molded body which is defined by Expression 2 described below is greater than or equal to 0.7 mm and less than 1.5 mm, Q > 1 / 4 × R 1 / 2 t 0 mm = 10 × W/ D 0 × S in Expression 2, W indicates a mass (g) of a plate-like foamless test piece which is defoamed and is obtained by defoaming a square plate-like test piece cut out from the polypropylene-based foamed molded body at 200°C under reduced pressure, and then, by performing a pressurized slow cooling treatment, D 0 indicates a density (g/cm 3) of the obtained foamless test piece, and S indicates an area (cm 2) of one surface of the square plate-like test piece cut out from the polypropylene-based foamed molded body; wherein the polypropylene-based foamed molded body contains only a propylene-ethylene-based block copolymer and ethylene·α-olefin copolymer rubber as a resin component, and wherein the propylene-ethylene-based block copolymer includes a propylene homopolymer portion and an ethylene-propylene random copolymer portion, and MFR (230°C, a load of 2160 g) of the propylene homopolymer portion is greater than or equal to 50 g/10 minutes and less than or equal to 1000 g/10 minutes, the MFR being determined on the basis of an ASTM D-1238 method, in the ethylene-propylene random copolymer portion, an inherent viscosity [η] which is measured at 135 ° C in decahydronaphthalene is greater than 4 dl/g and less than or equal to 10 dl/g, and a content rate of a structural unit derived from ethylene in the ethylene-propylene random copolymer portion is greater than or equal to 20 mol% and less than or equal to 60 mol%. wherein a density which is measured on the basis of ISO1183 is greater than or equal to 0.15 g/cm 3 and less than or equal to 0.54 g/cm 3, thermal resistance at 30°C in a thickness direction which is measured on the basis of ASTM E1530 is greater than or equal to 0.020 m 2 ·K/W and less than or equal to 0.125 m 2 ·K/W, thermal capacity per unit area at 30°C is greater than or equal to 1.0 kJ/m 2 ·K and less than or equal to 2.5 kJ/m 2 ·K, Expression 1 described below is satisfied, and a substantial thickness (t 0) of the polypropylene-based foamed molded body which is defined by Expression 2 described below is greater than or equal to 0.7 mm and less than 1.5 mm, Q > 1 / 4 × R 1 / 2 t 0 mm = 10 × W/ D 0 × S in Expression 2, W indicates a mass (g) of a plate-like foamless test piece which is defoamed and is obtained by defoaming a square plate-like test piece cut out from the polypropylene-based foamed molded body at 200°C under reduced pressure, and then, by performing a pressurized slow cooling treatment, D 0 indicates a density (g/cm 3) of the obtained foamless test piece, and S indicates an area (cm 2) of one surface of the square plate-like test piece cut out from the polypropylene-based foamed molded body; wherein the polypropylene-based foamed molded body contains only a propylene-ethylene-based block copolymer and ethylene·α-olefin copolymer rubber as a resin component, and wherein the propylene-ethylene-based block copolymer includes a propylene homopolymer portion and an ethylene-propylene random copolymer portion, and MFR (230°C, a load of 2160 g) of the propylene homopolymer portion is greater than or equal to 50 g/10 minutes and less than or equal to 1000 g/10 minutes, the MFR being determined on the basis of an ASTM D-1238 method, in the ethylene-propylene random copolymer portion, an inherent viscosity [η] which is measured at 135 ° C in decahydronaphthalene is greater than 4 dl/g and less than or equal to 10 dl/g, and a content rate of a structural unit derived from ethylene in the ethylene-propylene random copolymer portion is greater than or equal to 20 mol% and less than or equal to 60 mol%.