To enhance adhesion between a resin and a glass filler and at the same time to disperse a rubber in the resin to thereby improve mechanical properties of a molded body. Provided is a resin composition containing an engineering plastic (A), a glass filler (B) and a rubber-containing graft polymer (C), wherein a ratio of an acrylonitrile-derived component in a chloroform-soluble component of the resin composition is not more than 2.0 mass %, a content of a fatty acid in 100 parts by mass of the resin composition is not more than 0.03 parts by mass, a total content of calcium and magnesium in 100 parts by mass of a dry sample of the resin composition extracted with chloroform is not more than 0.0008 parts by mass, and a content of aluminum is not more than 0.0008 parts by mass. Also provided is a resin composition further containing a salt (D) of an alkali metal and a strong acid. The engineering plastic (A) is preferably an aromatic polycarbonate resin. Also provided is a molded body obtained by molding the resin composition.