PURPOSE: To provide a polypropylene compsn. having resistance to impact and marring, by blending two ethylene/propylene copolymers, a polyether block amide and an unsaturated carboxylic acid-modified polypropylene polymer.

CONSTITUTION: 20W40wt% crystalline ethylene/propylene block copolymer, 25W40wt% polyether block amide of the formula (wherein PA is polyamide; PE is polyether), 25W35wt% amorphous ethylene/propylene copolymer and 5W20wt% polypropylene polymer modified with an unsaturated carboxylic acid (derivative) such as acrylic acid or maleic anhydride are mixed together to obtain the desired polypropylene compsn. The compsn. is suitable for use as an exterior finish material for automobiles, particularly as a structure material for a bumper.