To provide a securing structure for high tension yarn which facilitates attaching and detaching of lenses of a Nylol (R).frame which holds the lenses by half rims and high tension yarn.

One end of the high tension yarn 4 is provided with a hook 9 and a pipe nut 10 is constituted to the other end. The hook 9 is detained to a detaining part 12 disposed at the half rim 1 and the pipe nut 10 is fitted into a hole 13 disposed at the half rim 1 and is screwed.