To provide a mounting structure for upper and lower eyewire locks and a frame member which is capable of easily and safely attaching and detaching the eyewire locks and the frame member.

The mounting structure for the upper and lower eyewire locks and the frame member 7 is a mounting structure for the upper and lower eyewire locks and the frame member, in which the frame member 7 is formed with a recessed part opened in a horizontal direction and a downward direction, and the upper eyewire lock 10a is inserted therein from the horizontal direction to fit and fix the frame member 7 and the upper eyewire lock 10a and eyewire lock screws 13 are inserted from below into the through-holes of the upper and lower eyewire locks and are screwed into the through-holes, of the upper eyewire lock, by which the upper and lower eyewire locks and the frame member are fixed. Accordingly, the lenses can be exchanged while the frame member is fitted to the eyewire locks and is held temporarily fixed and conversely, the frame member can be removed while the lenses are held fitted to the eyewires.