Disclosed is a polypropylene resin composition comprising (A) a propylene-based polymer, (B) a styrene-based elastomer, (C) a hindered amine light stabilizer having a secondary amino group, and (D) a nucleating agent containing an aromatic phosphate metal salt. The content of the propylene-based polymer is more than 90% by mass and 99% by mass or less, and the content of the styrene-based elastomer is 1% by mass or more and less than 10% by mass.