To provide a coating resin composition which is curable even when a radical polymerization inhibit or is attached to the surface of a substrate and can provide a protective film having excellent antistatic ability, hardness, adhesion, UV transparency and water resistance.

The coating resin composition comprises a polymerizable acid phosphate of formula (I): {CH2=C(R1)-C(O) [OCH2C(R2)H]n}mOP(O) (OH)3-m (wherein R1 is a methyl group or the like; R2 is hydrogen or the like; m is an integer of 1 or 2; and n is an integer of 1-8), a silane compound of formula (II): X-Si(Z)(Y)-Y (wherein X is a methacryloxyalkyl group or the like; Y is an alkoxy group; and Z is an alkoxy group or the like) (including, e.g. 3- methacryloxypropyltrimethoxysilane), a metal oxide, and a compound having two or more polymerizable unsaturated double bonds (including, e.g. pentaerythritol tetraacrylate).