A polyarylene sulfide resin composition including: 100 parts by weight of (A) a polyarylene sulfide having a carboxyl group content of not less than 60 µmol/g; and 10 to 400 parts by weight of (B) a glass fiber, wherein, when the cumulative integral value from the molecular weight of 100 to the molecular weight of 10,000 in a molecular weight distribution curve of (A) the polyarylene sulfide is taken as 100, the cumulative integrated value at the molecular weight of 4,000 is 48 to 53, and wherein, when the melt flow rate of (A) the polyarylene sulfide is defined as MFR1, and when the melt flow rate obtained after mixing (A) the polyarylene sulfide with an epoxy silane coupling agent at a weight ratio of 100:1, and heating the resulting mixture at 315.5°C for 5 minutes is defined as MFR2, the rate of change represented by MFR2/MFR1 is not more than 0.085. Provided is a polyarylene sulfide resin composition that has excellent mechanical strength, particularly weld strength, generates less burrs, and has excellent adhesiveness to an epoxy resin.