A resin composition comprising: a tri-functional or more (meth)acrylate having an alkoxysilyl group; and at least one of a metal oxide fine particle having a hydroxyl group on a surface thereof and a metalalkoxide, wherein the tri-functional or more (meth)acrylate having the alkoxysilyl group and the at least one of the metal oxide fine particle having the hydroxyl group on the surface thereof and the metal alkoxide covalently bind, and the production method thereof.