2 3 has a lens retaining spaces 21 31 for insert molding a lens units 22 32 thereon the right lens frame 2 and the left lens frame 3 respectively has a gaskets 23 33 each of which is formed integrally with far away from the side of each of the lens units 22 32 for touching the periphery of a wearer 39 s eyehole an upper and lower portions of an outer periphery of the lens frames 2 3 respectively have a first connection bases 24 34 and a second connection bases they are located a lower portion respectively of the outer periphery of the lens frames 2 3 now shown in figure the first connection bases 24 34 have a first slots 25 35 also the second connection base has a second slots formed on the lower portion of the outer periphery of the lens frames 2 3 as shown in fig4 an openings 241 341 in the upper portion of the outer periphery of the lens frames 2 3 for facility a first strap 50 and a second strap 51 of the strap means 5 passing through the first slots 25 35 respectively the strap mean 5 includes a first strap 50 a second strap 51 and a bunching element 52 wherein.