PURPOSE: To provide the composition having basic properties such as tensile strength and bending strength more excellent than those of a glass fiber reinforced plastic composition and being capable of giving a molding weld strength enough to resist breaking.

CONSTITUTION: The composition essentially consists of a fibers filler and a silicone rubber, and the amount of the fibrous filler such as an organic fiber, an inorganic fiber or whiskers added is 5-70wt.% based on the resin composition, while that of the silicone rubber added is in the range of 0.1-10wt.%.