Patent ID: 8179619

Claim:
A resin lens comprising: an optical functional section that has a first optical functional face and a second optical functional face; and a flange section that is formed around the optical functional section, the flange section having a flange face at a first optical functional face side of the flange section, and a reference face formed on a part of the flange face, which is configured to be an annular shape, and is used as a positioning reference, wherein the reference face is positioned and fixed at the flange section when the resin lens is assembled with an optical device, is used as the positioning reference during positioning and fixing, and is formed on one face of the flange section, one side face of the resin lens, including the first optical functional face, the flange face, and the reference face is molded by a first mold that substantially forms the first optical functional face and a second mold that substantially forms the flange section, during molding, the reference face is formed in the annular shape at a position that is close to an inner periphery of the flange face, and both the reference face and the first optical functional face are molded by the first mold, and a part of the flange face that is closer to an outer periphery than the reference face is molded by the second mold, an annular border, which is formed between a part molded by the first mold and a part molded by the second mold, is positioned closer to the outer periphery than the reference face on the part of the flange face, a portion of the flange face, including the annular border, located outside of the reference face, which is lower than the reference face, and an annular step formed at the portion by lowering an outer portion of the portion adjacent to the annular border that is molded by the second mold below an inner portion of the portion adjacent to the annular border that is molded by the first mold, the outer portion and the inner portion are substantially annular.