To obtain both a polyphenylene sulfide resin composition having a weld strength, especially an extremely high weld strength formed at the side of a cylindrical part and an injection molding.

This polyphenylene sulfide resin composition is characterized in that the polyphenylene sulfide resin composition is obtained by compounding (a) 100 pts.wt. of a polyphenylene sulfide resin with (b) 4.5-15 pts.wt. of an olefin-based (co)polymer and (c) 20-90 pts.wt. of an inorganic filler and at least one kind of an epoxy group-containing olefin-based copolymer is contained as the (b) the olefin-based (co)polymer.