PURPOSE: To obtain a polyarylene sulfide resin composition excellent in impact resistance, tensile elongation and effective as a not reinforced-type by adding a specific reactive organopolysiloxane to a polyarylenesulfice resin.

CONSTITUTION: This polyarylenesulfide resin composition comprises adding (B) a reactive organopolysiloxane, preferably the compound of formula III having 50-6000 viscosity, containing at least each one of (i) an organic reactive functional group of R1-X (R1 is a direct bond or a 1-5C divalent hydrocarbon; X is a functional group having an organic reactivity) bonded to Si in one molecule, (ii) a condensable silylalkyl group of formula I [R2 is a 2-5C alkylene; R3, R4 are each H or a 1-5C alkyl; (a) is 2, 3] and (iii) a polyoxyalkylene of formula II [R5 is H, an acyl or a monovalent hydrocarbon; (l) is 0 or integer; (m), (n) are each 0 or ≤150 integer, (m+n) is 1-150] to (A) polyarylenesulfide resin.