This polymer composition contains: a methacrylate resin (A) having at least 50 mass% of a repeating unit derived from methyl methacrylate; a block copolymer (B) having a polymer block (a) comprising a repeating unit derived from an alkylester (meth)acrylate and a polymer block (b) comprising a repeating unit derived from a conjugate diene compound; and a liquid polyorganosiloxane (C). The amount of the block copolymer (B) is 1-80 masses for every 100 masses of the methacrylate resin (A), and the amount of the liquid polyorganosiloxane (C) is 0.05-0.5 masses for every 100 masses of the block copolymer (B). The polymer composition is formed by dispersing a phase comprising the block copolymer (B) in a continuous phase comprising the methacrylate resin (A).
