The present invention can provide a methacrylic resin which has excellent transparency and color and less defects such as fish eyes and thus suitable for optical films by adding (A) a polymeric dispersant represented by formula (1) below and (B) an inorganic salt and/or organic salt selected from alkali metal salts, alkaline earth metal salts and ammonium salts when methyl methacrylate alone or a monomer mixture containing methyl methacrylate as one component is subjected to suspension-polymerization: (n=10 to 60 mol %, m=40 to 90 mol %, R1 is hydrogen or a methyl group, R2 is an alkyl group having 1 to 8 carbon atoms, and M is an alkali metal or alkaline earth metal or NH4.)