A thermoplastic resin composition comprising (A) a polyolefin-type thermoplastic elastomer or a similar thermoplastic resin, (B) an organopolysiloxane represented by the following average unit formula: R1aSiO(4-a)/2 {where R1 is a univalent hydrocarbon group having 1 to 10 carbon atoms, and “a” is a number in the range of 1.95 to 2.05}, and (C) a metal deactivator; and a product molded from the aforementioned composition. The thermoplastic resin composition is suitable for obtaining molded products that are characterized by their ability to suppress development of defects on the product surfaces after long-term outdoor exposure.