A methyl methacrylate-styrene copolymer resin composition in the form of an optical sheet which comprises: (A) 100 parts by weight of a methyl methacrylate-styrene copolymer resin having a weight ratio of methyl methacrylate units to styrene units of 75:25 to 50:50, (B) 0.5 to 5 parts by weight of a lithium sulfonate having a C.sub.8 -C.sub.16 alkyl group, and (C) 0.3 to 1.5 parts by weight of glass beads, as a light diffuser. The methyl methacrylate-styrene copolymer resin composition in the form of an optical sheet of the present invention has excellent antistatic properties and appearance properties. By using the lithium sulfonate in the form of a solution, excellent light diffusion properties (without impaired dispersion properties), excellent total light transmittance and desired coloring properties can be obtained, and hence desirable optical properties and desirable physical properties and dimensional stability can be obtained.
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