A lens fixation method includes: allowing a first pressing portion to come into contact with a proximal end portion of a heat caulking piece-like portion before a heat caulking tool comes into contact with a distal end portion of the heat caulking piece-like portion; pressing an outer peripheral portion of the heat caulking piece-like portion; and pressing the distal end portion of the heat caulking piece-like portion toward a caulking region, which is provided on a lens, in an axial direction of a lens frame by a second pressing portion.
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