CUTTING TOOL

PROBLEM TO BE SOLVED: To provide a tool for achieving the adjustment of optimal deflection when connecting an exchangeable cutting part with a holder.SOLUTION: The tool 1 includes the exchangeable cutting part 5, and the holder 3 fitted so that the exchangeable cutting part 5 is installed to be exchangeable. The exchangeable cutting part 5 includes a first part including at least one cutting edge 25 and a second part connected to the holder 3. The second part includes a conical outside contact face and an outside cylindrical thread. The holder 3 includes an inside cylindrical thread and a conical inside contact face detachably screwed into an outside thread. The conical outside contact face and the conical inside contact face can be mutually engaged to position the exchangeable cutting part 5 and the holder 3 to each other.