PURPOSE: To obtain the titled composition having remarkably improved long- term frictional and abrasion characteristics, decreased squeaking in sliding, etc., and suitable as a sliding part of automobile, etc., by compounding a specific amount of a silicone oil having a specific viscosity to a thermoplastic polyester resin or polyacetal resin.

CONSTITUTION: (A) 99.9W80pts.wt., preferably 99.7W90pts.wt. of a thermoplastic resin or a polyacetal resin is compounded with (B) 0.1W20pts.wt., preferably 0.3W10pts.wt. of a silicone oil having a viscosity of ≥150,000cst, preferably 200,000W1,000,000cst.