To provide a polypropylene resin composition for inorganic physical expansion molding capable of obtaining a fine foamed article having fine and uniform bubbles having, for example, an average cell diameter of 1,000 nm or less, and a foamed article thereof.

The polypropylene resin composition for the inorganic physical expansion molding contains a graft copolymer comprising a polymer of an ethylenic unsaturated monomer (b) having a polypropylene resin (a) as a main chain component and a (meth)acrylate or vinyl carboxylate as a side chain component. The polymer of the ethylenic unsaturated monomer (b) constituting the graft copolymer is a crosslinked product in which a number average dispersed particle diameter is 100-1,000 nm and standard deviation relative to the average dispersed particle diameter is 5-20%.