Mold

A mold comprising:

• a fixed mold including a first mold plate constituting a fixed mold main unit;
• a movable mold including a second mold plate constituting a movable mold main unit;
• and
• a molding cavity formed by combining the fixed mold and the movable mold with each other,
• wherein at least one of the first and the second mold plates includes:
• a nest in a stepped pillar shape inserted in an insertion hole of the at least one of the first and the second mold plates, the nest including:
• a large diameter portion engaged in the insertion hole, and
• a small diameter portion in which a first transfer surface to form an optical function surface of a molded product is formed;
• and
• an outer-diameter forming member in a stepped cylindrical shape inserted in the insertion hole, the outer-diameter forming member including:
• a cylindrical portion arranged around the small diameter portion of the nest, and engaged in the insertion hole, and
• a flange portion in which a second transfer surface to form an outer diameter portion of the molded product is formed, and
• wherein the nest and the outer-diameter forming member are provided as a part of the at least one of the first and the second mold plates.