PURPOSE: To obtain a Fresnel lens having high surface hardness, free from bubbles and having satisfactory mold releasability, satisfactory adhesion to a film or a sheet and satisfactory shape reproducibility by molding a lens from specified resins as an ionizing radiation-curable resin.

CONSTITUTION: A resin contg. a polymerizable monomer having there or more functional groups is used as a part of an ionizing radiation/curable resin 2 close to a mold 1 to which the wavy pattern of a Fresnel lens has been reversely transferred. The resulting cured body is made hard and a Fresnel lens having low adhesive strength, that is, satisfactory mold releasability can be molded. A resin contg. a mono-or bifunctional polymerizable monomer is used as a part of the resin 2 close to a film or a sheet. The resulting cured body is made soft and a Fresnel lens having high adhesive strength can be molded. In this two-layered structure, a diffusing agent or a mold releasing agent is incorporated into the part close to the lens surface. The objective Fresnel lens having a high local density at the desired position is molded.