A polypropylene resin composition, comprising a propylene polymer satisfying the following requirement (a); a soft propylene copolymer satisfying the following requirement (b); and a polyolefin selected from polypropylene and an ethylene·propylene·α-olefin copolymer and containing a structural unit derived from an unsaturated carboxylic acid and/or a derivative thereof, wherein (a) a melting point observed by differential scanning calorimetry is 100°C or more, and (b) an MFR measured at 230°C and a load of 2.16 kg according to ASTM D-1238 is in the range of 0.01 to 100 g/10 min, and at least one of the following requirements (b-1) and (b-2) is satisfied: (b-1) a syndiotactic triad fraction (rr fraction) measured by 13 C-NMR is 60% or more, and (b-2) a structural unit derived from propylene is contained at 55 to 90 mol % and a structural unit derived from at least one olefin selected from α-olefins having 2 to 20 carbon atoms (excluding propylene) is contained at 10 to 45 mol % (provided that a total of the structural unit derived from propylene and the structural units derived from α-olefins having 2 to 20 carbon atoms (excluding propylene) is 100 mol %), and relation between a intrinsic viscosity [η] (dL/g) measured at 135°C in decalin and the MFR (g/10 min, 230°C, load: 2.16 kg) satisfies the relation represented by an expression: 1.50 × MFR − 0.20 ≤ η ≤ 2.65 × MFR − 0.20. a soft propylene copolymer satisfying the following requirement (b); and a polyolefin selected from polypropylene and an ethylene·propylene·α-olefin copolymer and containing a structural unit derived from an unsaturated carboxylic acid and/or a derivative thereof, (a) a melting point observed by differential scanning calorimetry is 100°C or more, and (b) an MFR measured at 230°C and a load of 2.16 kg according to ASTM D-1238 is in the range of 0.01 to 100 g/10 min, and at least one of the following requirements (b-1) and (b-2) is satisfied: (b-1) a syndiotactic triad fraction (rr fraction) measured by 13 C-NMR is 60% or more, and (b-2) a structural unit derived from propylene is contained at 55 to 90 mol % and a structural unit derived from at least one olefin selected from α-olefins having 2 to 20 carbon atoms (excluding propylene) is contained at 10 to 45 mol % (provided that a total of the structural unit derived from propylene and the structural units derived from α-olefins having 2 to 20 carbon atoms (excluding propylene) is 100 mol %), and relation between a intrinsic viscosity [η] (dL/g) measured at 135°C in decalin and the MFR (g/10 min, 230°C, load: 2.16 kg) satisfies the relation represented by an expression: 1.50 × MFR − 0.20 ≤ η ≤ 2.65 × MFR − 0.20. (b-1) a syndiotactic triad fraction (rr fraction) measured by 13 C-NMR is 60% or more, and (b-2) a structural unit derived from propylene is contained at 55 to 90 mol % and a structural unit derived from at least one olefin selected from α-olefins having 2 to 20 carbon atoms (excluding propylene) is contained at 10 to 45 mol % (provided that a total of the structural unit derived from propylene and the structural units derived from α-olefins having 2 to 20 carbon atoms (excluding propylene) is 100 mol %), and relation between a intrinsic viscosity [η] (dL/g) measured at 135°C in decalin and the MFR (g/10 min, 230°C, load: 2.16 kg) satisfies the relation represented by an expression: 1.50 × MFR − 0.20 ≤ η ≤ 2.65 × MFR − 0.20.