To provide a lightweight polypropylene resin composition with the excellent balance of fluidity (moldability) and physical properties, and a molding thereof.

The polypropylene resin composition includes, based on 100 pts.wt. of a propylene-ethylene block copolymer (A component), 1-20 pts.wt. of a talc with a 1-10 μm average particle size (B component), 1-20 pts.wt. of a fibrous magnesium sulfate with a 0.1-1.5 μm average fiber diameter and a 10-30 μm average fiber length (C component), and 1-100 pts.wt. of an elastomer (D component). The weight ratio (B:C) of the talc (B component) and the fibrous magnesium sulfate (C component) is in a range of 3:1 to 1.5:1. The density of the resin composition is 0.950-1.000 g/cm³. Also, there is provided the molding thereof.