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 thread engagement part that is provided so as to project from either one of said first fixing member and said second fixing member； a flexible, tubular insertion part, said one of the fixing members 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； and, 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.La présente invention concerne un outil de fixation à filetage comprenant: un premier élément de fixation qui comporte un trou de vis et une première surface de prise en sandwich； un second élément de fixation qui comporte une seconde surface de prise en sandwich et qui est fixé par vissage au premier élément de fixation； une partie de mise en prise par filetage qui est disposée de façon à faire saillie à partir dudit premier élément de fixation ou dudit second élément de fixation； une partie d'insertion tubulaire flexible, un desdits éléments de fixation étant fixé à une partie d'extrémité de bout de la partie d'insertion； un élément d'actionnement qui est inséré à travers la partie d'insertion et qui est relié à l'aut
