This invention provides polypropylene resin compositions exhibiting a strongly improved balance of physical properties in comparison to related polypropylene materials. The materials can be used in both interior and exterior parts of automobiles, have excellent thin-wall moldability and can effectively reduce generation of flow marks. Particularly, it provides a polypropylene resin composition which comprises specified amounts of (A) a specific ethylene-propylene block copolymer, (B) a specific thermoplastic elastomer and (C) talc, wherein it has specified values of physical properties measured by ASTM and has a degree of b-axis orientation of 720 or more which is calculated from the ratio of differential peak intensities measured by wide-angle X-ray diffraction of the central area of an ASTM No. 1 dumbbell prepared by injection molding.