A machine tool having a rotation function and a milling function includes a spindle, a housing member that supports the spindle rotatably, a main clamp which is provided on the spindle, an auxiliary terminal which is provided on the housing member and a double arm with a first gripper and a second gripper. The auxiliary clamp clamped during attachment of a solid tool, together with the main terminal, a die holder firmly. The double arm replaced by rotational and sliding movements of the gripped by the first gripper tool holder by a measure taken by the second gripper further tool holder. The auxiliary clamp is arranged in a position in which they do not interfere with the double arm, which moves during the change of the tool holders. By such a configuration can be a machine tool that achieves a clamping force which is sufficient to withstand the load during a turning process, and which allows the tool change in a kruzen period of time, and which is used in such a machine tool, a tool holder, can be created ,