[Object] Techniques are disclosed for tool holders that non-rotatably hold tools, which can prevent long continuous chips from wrapping around the tool or a workpiece.
[Solution] A tool holder 100 holds a tool 170 in a non-rotatable manner. When an attaching surface 112a of a body part (110, 120, 150) of the tool holder 100 is attached to a tool holder attachment surface of a machine tool, cooling medium supplied from the machine tool is conducted through a first body part passage (114, 124). Furthermore, a rotary member 130 is rotationally driven by a drive mechanism provided in the machine tool. As a result of a rotary part rotating in conjunction with the rotation of the rotary member 130, a pump 200 increases the pressure of the cooling medium suctioned from an inlet part 201 to a pressure corresponding to the rotational speed of the rotary part, and discharges the cooling medium, the pressure of which has been increased, from an outlet part 202. By way of a second body part passage (125, 115), cooling medium discharged from the outlet part 202 is sprayed from a spray hole 161 of a nozzle 160 onto a processed part.