Abstract: Provided is a method of manufacturing a lens including a lens surface and a flange expanding radially from a circumference of the lens surface, the method including: filling a gap between a lower mold and an upper mold with a resin material that is energy-beam curable, the lower mold including a concave portion and an annular recess around the concave portion; and curing the resin material with which the gap is filled while irradiating the resin material with an energy beam, in which the annular recess includes an inner circumferential wall portion corresponding to an outer circumferential wall portion of the flange, and the filling includes filling the annular recess with the resin material with the lower mold and the upper mold spaced at the annular recess.