The resin composition of the present invention comprises a polyvinyl acetal resin (A) and an acrylic-based polymer (B), in which the acrylic-based polymer (B) is a polymer of a monomer component comprising an acrylic-based monomer, a dHSP/R of the monomer component relative to the polyvinyl acetal resin (A) is 1.16 or less, and a content of the acrylic-based polymer (B) is 20 parts by mass or more and 90 parts by mass or less based on 100 parts by mass of the polyvinyl acetal resin (A).