To increase the crystallization rate of polypropylene to higher than obtd. by the nucleation effect of talc to thereby provide a polypropylene resin compsn. which gives a molded item having a high rigidity, while hardly exhibiting the decrease in impact strength, and excellent in the balance among physical properties by adding a partial metal salt of rosin acid to a compsn. comprising an isotactic polypropylene and/or an ethylene-propylene block copolymer, a thermoplastic rubber, and talc.

This compsn. comprises 30-94 pts.wt. isotactic polypropylene and/or ethylene-propylene block copolymer (A), 5-40 pts.wt. rubber component (C) 1-30 pts.wt. talc (C), and a nucleating agent mainly comprising a particle metal salt of rosin acid (D) in an amt. of 0.01-5 wt.% of ingredient A, the sum of ingredients A, B, and C being 100 pts.wt.