A radiation curable resin composition for a Fresnel lens is provided, which
exhibits a high elastic modulus and a high refractive index and is
superior in adhesion to the plastic substrate and is superior in
transparency. A lens layer exhibits excellent shape retention over a wide
temperature range and is less likely to chip and crack due to an external
force. A Fresnel lens sheet using the radiation curable resin composition
is also provided. The resin composition comprises, as an essential
component, an epoxy (meth)acrylate (a) having an epoxy equivalent per
weight of 450 g/eq or more, which has a cyclic structure and two or more
(meth)acryloyl groups; a specific trifunctional (meth)acrylate (b); a
(meth)acrylate (c) having a molecular weight of 700 or less from an
aliphatic polyhydric alcohol having an oxypropylene structure; and a
monofunctional (meth)acrylate (d) having a cyclic structure.
