An endo file for dental endodontic treatment includes: a head portion inserted into and detachably coupled to a hand piece； a tissue removing portion inserted, from the lower side of the head piece, into a patient's root canal for removing the nerve of a tooth； and a stress dispersion portion provided between the head portion and the tissue removing portion and having at least one horizontal penetration hole so as to buffer stress concentration generated during the rotation of the endo file, and to minimize endo file breakage.
