PURPOSE: To prevent an error in boring by providing lens supporting parts with stud bolts and screw set holes, setting spectacle lenses by means of these stud bolts and nuts and screwing set screws into the internal thread holes of the spectacle lenses with the screw set holes as a reference, thereby setting the lenses.

CONSTITUTION: A bridge 1 has the lens supporting parts 11, 11 at both ends. The supporting parts 11 are provided with the stud bolts 12 on their rear surfaces and are provided with the screw set holes 13 on the side outer by a distance β from the stud bolts 12. On the other hand, the right and left plastic lenses L, L erecting in parallel at both ends of the bridge 1 are provided with inner bolt holes 3' facing the stud bolts 12 of the supporting parts 11. The lenses are further provided with the internal thread holes 31' in the parts apart by a distance β from the inner bolt holes 3' as a center. The stud bolts 12 are inserted into the inner bolt holes 3' and the set screws 15 are screwed into the internal thread holes 31', by which the plastic lenses L, L are fixed.