A propylene resin composition comprising: a propylene-based polymer; and an ethylene-α-olefin copolymer, the ethylene-α-olefin copolymer not containing a monomer unit derived from propylene, wherein a content of the propylene-based polymer and a content of the ethylene-α-olefin copolymer are 60 to 90 parts by mass and 10 to 40 parts by mass, respectively, with respect to 100 parts by mass in total of the propylene-based polymer and the ethylene-α-olefin copolymer, and wherein the propylene-based polymer comprises (i) a propylene homopolymer having a molecular weight distribution Mw/Mn of 6.0 or more and (ii) a heterophasic propylene polymer material, with the heterophasic propylene polymer material being a mixture having a structure in which a polymer containing a monomer unit derived from at least one α-olefin selected from the group consisting of ethylene and α-olefins having 4 or more and 12 or less carbon atoms and a monomer unit derived from propylene disperses in a matrix of a polymer containing 80% by mass or more of a monomer unit derived from propylene provided that total mass of polymer is 100% by mass, with the content of polymer in the heterophasic propylene polymer material being 5 to 50 % by mass when the content of the ethylene-α-olefin copolymer contained in the propylene resin composition is considered 100 % by mass; wherein the ethylene-α-olefin copolymer is a copolymer containing a monomer unit derived from ethylene and a monomer unit derived from α-olefins having 4 to 12 carbon atoms, wherein the total of the content of the monomer unit derived from ethylene and the content of the monomer unit derived from α-olefins having 4 to 12 carbon atoms contained in copolymer is 100 % by mass when the total mass of component is considered 100 % by mass; a degree of orientation of a b-axis in an α crystal of the propylene-based polymer in a molded article is 85.0% or more, wherein the molded article is obtained by injection molding the propylene resin composition into a mold cavity of 100 mm (width) × 400 mm (length) × 3 mm (thickness) under conditions of a cylinder temperature of 220°C, a mold temperature of 50°C and an injection speed of 23 mm/sec, and the degree of orientation is an average of degrees of orientation obtained by a wide-angle X-ray analysis where X-rays are incident on two directions vertical to a thickness direction of the molded article and orthogonal to each other. a propylene-based polymer; and an ethylene-α-olefin copolymer, the ethylene-α-olefin copolymer not containing a monomer unit derived from propylene, the propylene-based polymer comprises (i) a propylene homopolymer having a molecular weight distribution Mw/Mn of 6.0 or more and (ii) a heterophasic propylene polymer material, with the heterophasic propylene polymer material being a mixture having a structure in which a polymer containing a monomer unit derived from at least one α-olefin selected from the group consisting of ethylene and α-olefins having 4 or more and 12 or less carbon atoms and a monomer unit derived from propylene disperses in a matrix of a polymer containing 80% by mass or more of a monomer unit derived from propylene provided that total mass of polymer is 100% by mass, with the content of polymer in the heterophasic propylene polymer material being 5 to 50 % by mass when the content of the ethylene-α-olefin copolymer contained in the propylene resin composition is considered 100 % by mass; wherein the ethylene-α-olefin copolymer is a copolymer containing a monomer unit derived from ethylene and a monomer unit derived from α-olefins having 4 to 12 carbon atoms, wherein the total of the content of the monomer unit derived from ethylene and the content of the monomer unit derived from α-olefins having 4 to 12 carbon atoms contained in copolymer is 100 % by mass when the total mass of component is considered 100 % by mass; a degree of orientation of a b-axis in an α crystal of the propylene-based polymer in a molded article is 85.0% or more, wherein the molded article is obtained by injection molding the propylene resin composition into a mold cavity of 100 mm (width) × 400 mm (length) × 3 mm (thickness) under conditions of a cylinder temperature of 220°C, a mold temperature of 50°C and an injection speed of 23 mm/sec, and the degree of orientation is an average of degrees of orientation obtained by a wide-angle X-ray analysis where X-rays are incident on two directions vertical to a thickness direction of the molded article and orthogonal to each other. the molded article is obtained by injection molding the propylene resin composition into a mold cavity of 100 mm (width) × 400 mm (length) × 3 mm (thickness) under conditions of a cylinder temperature of 220°C, a mold temperature of 50°C and an injection speed of 23 mm/sec, and the degree of orientation is an average of degrees of orientation obtained by a wide-angle X-ray analysis where X-rays are incident on two directions vertical to a thickness direction of the molded article and orthogonal to each other.