A polyphenylene sulfide resin composition including 99 to 60 wt % of a polyphenylene sulfide resin (a) and 1 to 40 wt % of a polyamide resin (b), wherein the polyphenylene sulfide resin (a) forms a sea phase while the polyamide resin (b) forms an island phase, and that the number average dispersed particle size of the polyamide resin (b) is less than 500 nm; and a polyphenylene sulfide resin composition, wherein a compound having one or more types of groups selected from epoxy group, amino group and isocyanate group is added by 0.1 to 10 parts by weight per 100 parts by weight in total of the polyphenylene sulfide resin (a) and the polyamide resin (b), as a compatibilizing agent (c).