A polyarylene sulfide resin composition for extrusion or blow molding comprising: a polyarylene sulfide resin; an olefinic copolymer containing an epoxy group; and an olefinic copolymer not containing an epoxy group, as a resin component, wherein a content of the resin component is 95 mass% or more, a total content of the olefinic copolymer containing an epoxy group and the olefinic copolymer not containing an epoxy group relative to 100 parts by mass of the polyarylene sulfide resin is 33 to 55 parts by mass, and a content of the olefinic copolymer not containing an epoxy group relative to 100 parts by mass of the polyarylene sulfide resin is 5 to 20 parts by mass, and the olefinic copolymer containing an epoxy group contains a constituent unit derived from an α-olefin, a constituent unit derived from a glycidyl ester of an α,β-unsaturated acid, and a constituent unit derived from a (meth)acrylic acid ester, and the number of carbons of an alcohol residue in the constituent unit derived from the (meth)acrylic acid ester is 2 to 20, and the olefinic copolymer not containing an epoxy group contains a constituent unit derived from an α-olefin and a constituent unit derived from a (meth)acrylic acid ester, the number of carbons of an alcohol residue in the constituent unit derived from the (meth)acrylic acid ester is 2 to 20, and a content of the constituent unit derived from the (meth)acrylic acid ester relative to the olefinic copolymer not containing an epoxy group is 30 to 40 mass%. a polyarylene sulfide resin; an olefinic copolymer containing an epoxy group; and an olefinic copolymer not containing an epoxy group, as a resin component, wherein a content of the resin component is 95 mass% or more, a total content of the olefinic copolymer containing an epoxy group and the olefinic copolymer not containing an epoxy group relative to 100 parts by mass of the polyarylene sulfide resin is 33 to 55 parts by mass, and a content of the olefinic copolymer not containing an epoxy group relative to 100 parts by mass of the polyarylene sulfide resin is 5 to 20 parts by mass, and the olefinic copolymer containing an epoxy group contains a constituent unit derived from an α-olefin, a constituent unit derived from a glycidyl ester of an α,β-unsaturated acid, and a constituent unit derived from a (meth)acrylic acid ester, and the number of carbons of an alcohol residue in the constituent unit derived from the (meth)acrylic acid ester is 2 to 20, and the olefinic copolymer not containing an epoxy group contains a constituent unit derived from an α-olefin and a constituent unit derived from a (meth)acrylic acid ester, the number of carbons of an alcohol residue in the constituent unit derived from the (meth)acrylic acid ester is 2 to 20, and a content of the constituent unit derived from the (meth)acrylic acid ester relative to the olefinic copolymer not containing an epoxy group is 30 to 40 mass%. a content of the resin component is 95 mass% or more, a total content of the olefinic copolymer containing an epoxy group and the olefinic copolymer not containing an epoxy group relative to 100 parts by mass of the polyarylene sulfide resin is 33 to 55 parts by mass, and a content of the olefinic copolymer not containing an epoxy group relative to 100 parts by mass of the polyarylene sulfide resin is 5 to 20 parts by mass, and the olefinic copolymer containing an epoxy group contains a constituent unit derived from an α-olefin, a constituent unit derived from a glycidyl ester of an α,β-unsaturated acid, and a constituent unit derived from a (meth)acrylic acid ester, and the number of carbons of an alcohol residue in the constituent unit derived from the (meth)acrylic acid ester is 2 to 20, and the olefinic copolymer not containing an epoxy group contains a constituent unit derived from an α-olefin and a constituent unit derived from a (meth)acrylic acid ester, the number of carbons of an alcohol residue in the constituent unit derived from the (meth)acrylic acid ester is 2 to 20, and a content of the constituent unit derived from the (meth)acrylic acid ester relative to the olefinic copolymer not containing an epoxy group is 30 to 40 mass%.