To easily obtain a methacrylic resin composition excellent in mechanical properties such as tensile strength and impact resistance and optical properties such as transparency, thus suitable for various molded products.

This composition is obtained by polymerizing, through radical bulk polymerization, a polymerizable composition comprising 100 pts.wt. of methyl methacrylate monomer or its mixture with a monomer copolymerizable therewith, 20-70 pts.wt. of an uncured acrylonitrile-butadiene rubber and a radical polymerization initiator.