This thread fixing tool comprises: a first fixing member that has a screw hole and a first sandwiching surface； a second fixing member that has a second sandwiching surface and that is screw-fitted to the first fixing member； a flexible, tubular insertion part, either one of said first fixing member and said second fixing member being attached to a tip end part of the insertion part； an operating member that is inserted through the insertion part and that is linked to the other one of said first fixing member and said second fixing member； and an operating part that is connected to a base end part of the operating member. The thread fixing tool is configured such that: the first fixing member and the second fixing member are arranged such that the first sandwiching surface and the second sandwiching surface oppose one another in the axial direction of the insertion part； when the insertion part and the operating member are rotated relative to one another by operating the operating part, the second fixing member is screw-fitted to the first fixing member, and thereby, the first sandwiching surface and the second sandwiching surface approach one another； and the linkage between said operating member and said other fixing member is released when the operating part is subjected to a predetermined operation.La présente invention concerne un outil de fixation de fil comprenant : un premier élément de fixation doté d'un trou de vis et d'une première surface d'interposition ； un deuxième élément de fixation doté d'une deuxième surface d'interposition qui est vissé au premier élément de fixation ； une partie d'insertion tubulaire et flexible, l'un ou l'autre élément dudit premier élément de fixation et dudit deuxième élément de fixation étant fixé à une partie d'extrémité avant de la partie d'insertion ； un élément d'actionnement qui est inséré à travers la partie d'insertion et qui est relié à l'autre élément dudit premier élément de fixation et dudit deuxième élément de fi
