A fixing mechanism of a gut 6 holding a lens 20 onto a half rim 1 prevents the gut 6 from being cut off by a large force acting on a bent part of the gut 6. The fixing mechanism includes an attachment part 2 of the half rim 1, to which a part of the periphery of the lens 20 is held, the lens 20, and the gut 6 fixing the lens 20 to the attachment part 2 by pressing the periphery of the lens 20 and thereby pressing the lens 20 toward the attachment part 2. The fixing mechanism further includes holding members 8 and 11 holding each end of the gut 6 on the both sides of the attachment part 2 of the half rim 1, which holding members 8 and 11 are arranged in hollow parts 7 and 10, respectively, formed on both the side parts of the attachment part 2 of the half rim 1.
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