PURPOSE: To obtain a polypropylene composition having excellent mechanical strength and appearance and keeping extremely high rigidity at high temperature by compounding respective specific polypropylene resin, polyamide resin and modified polypropylene resin and compounding the mixture with glass fiber.

CONSTITUTION: The composition is produced by compounding (A) 40-50wt.% of a polypropylene resin having a melt flow rate (MFR; JIS-K-6758) of 0.1-4g/10min, (B) 60-45wt.% of a polyamide (preferably nylon 6 or nylon 66) having a relative viscosity [ηr] of 2-2.7 (in 96% H2SO4 at 25°C), (C) 10-30 pts.wt. (based on 100 pts.wt. of A+B) of a modified polypropylene resin grafted with an unsaturated carboxylic acid or its derivative (preferably maleic anhydride) at a grafting ratio of 0.1-3% and (D) 20-150 pts.wt. of glass fiber (preferably surface-treated with a silane compound).