PROBLEM TO BE SOLVED: To provide a holder for attaching a dental tool, which has a structure smaller and simpler than a head portion of a conventional holder main body and further has a mechanism in which a stopper does not easily come off from the head portion of the holder main body. SOLUTION: A holder 10 includes a holder main body 1, a stopper 4 having at least one insertion end portion, and a stopper fixing tool 5, and the at least one insertion end portion is accommodated in a stopper accommodating hole. Then, in the state where the stopper fixture 5 is accommodated in the fixture accommodating portion, the insertion end portion of the stopper is sandwiched between the side surface of the stopper fixture 5 and the accommodating surface of the stopper accommodating hole. It is a feature. [Selection diagram] Fig. 2【課題】従来のホルダー本体のヘッド部よりも小型で簡易な構造であり、更にストッパーがホルダー本体のヘッド部から容易に外れない機構を有する、歯科用工具を取り付けるためのホルダーを提供する。【解決手段】ホルダー10は、ホルダー本体1と、少なくとも1つの挿入端部を有するストッパー4と、ストッパー用固定具5とを含み、ストッパー用収容孔に前記少なくとも1つの挿入端部を収容し、そして固定具用収容部においてストッパー用固定具5収容した状態において、前記ストッパーの挿入端部が、前記ストッパー用固定具5の側面と前記ストッパー用収容孔の収容面とによって挟み込まれていることを特徴とする。【選択図】図2