PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition maintaining optical properties and heat resistance, having excellent mechanical strength (toughness), suppressed in bleed-out on the molding surface, and having molding surface sliding property; and to provide a method for producing the same.SOLUTION: A thermoplastic resin composition contains an acrylic resin (a) containing ≥40 mass% and ≤90 mass% of a methacrylate ester unit and/or an acrylate ester unit, ≥5 mass% and ≤40 mass% of an aromatic vinyl compound unit, and ≥5 mass% and ≤30 mass% of a compound unit represented by a specific structure, and a rubber-containing copolymer particle (b) having an average particle diameter of ≥0.04 μm and ≤0.13 μm and a multilayer structure, wherein the residual monomer amount in the thermoplastic resin composition is ≥0.2 mass% and ≤0.8 mass% with respect to 100 mass% of the thermoplastic resin composition; and the rubber-containing copolymer particle (b) is ≥0.1 pt
