PURPOSE: To obtain the subject composition consisting of a specific composition, having good mechanical properties and stiffness as well as high elongation and high toughness and useful as a sliding material being low in coefficient of friction under high speed sliding and its change and remarkably suppressed in heat build-up.

CONSTITUTION: The objective composition is obtained by blending 100 pts.wt. resin mixture consisting of (A) 50-99wt.% polyarylene sulfide resin (preferably polyparaphenylene sulfide resin composed of units of formula I) and (B) 50-1wt.% thermoplastic elastomer (e.g. polybutadiene-based elastomer) with (C) 0.1-10 pts.wt. aromatic maleimide compound selected from compounds of formula II and formula III [R1 is divalent organic group containing (substituted) phenylene; R2 is divalent hydrocarbon; (n)is 0-2] (e.g. p-phenylene bismaleimide) and further, blending 100 pts.wt. components A to C with (D) 0.1-25 pts.wt. terminal functional group-containing silicone compound (e.g. both terminal epoxy- modified silicone oil).