A tip holder that is formed in a cylindrical shape having a 1 st end and a 2 nd end, and that is adapted to hold a throw away tip; said tip holder comprising: (a) a support section that is formed on the 1 st end of the tip holder and adapted to hold the throw away tip, wherein the support section is formed into a box shape with an opening on the installation side of the throw away tip and is configured to come in contact with the throw away tip; (b) an inlet path that is formed along a center axis inside the tip holder, and has an aperture on the 2 nd end of the tip holder, wherein coolant is externally supplied to the inlet path through the aperture; (c) a heat exchange section that is formed as part of the flow path for the coolant using the box shape of the support section with the opening and connects with the inlet path, wherein heat exchange between the coolant that is supplied from the inlet path and the throw away tip is performed in the heat exchange section; and (d) a discharge path that is formed inside the tip holder, connects with the heat exchange section, and discharges the coolant after the heat exchange, (e) wherein the heat exchange section comprises a sealed space arranged between the support section and an installation surface of the throw away tip, and (i) wherein the opening faces at least the area closer to the cutting edge than to an end section of the throw away tip other than the cutting edge or (ii) wherein the volume of the sealed space closer to the cutting edge is greater than the volume of the sealed space at the end section other than the cutting edge of the throw away tip. (a) a support section that is formed on the 1 st end of the tip holder and adapted to hold the throw away tip, wherein the support section is formed into a box shape with an opening on the installation side of the throw away tip and is configured to come in contact with the throw away tip; (b) an inlet path that is formed along a center axis inside the tip holder, and has an aperture on the 2 nd end of the tip holder, wherein coolant is externally supplied to the inlet path through the aperture; (c) a heat exchange section that is formed as part of the flow path for the coolant using the box shape of the support section with the opening and connects with the inlet path, wherein heat exchange between the coolant that is supplied from the inlet path and the throw away tip is performed in the heat exchange section; and (d) a discharge path that is formed inside the tip holder, connects with the heat exchange section, and discharges the coolant after the heat exchange, (e) wherein the heat exchange section comprises a sealed space arranged between the support section and an installation surface of the throw away tip, and (i) wherein the opening faces at least the area closer to the cutting edge than to an end section of the throw away tip other than the cutting edge or (ii) wherein the volume of the sealed space closer to the cutting edge is greater than the volume of the sealed space at the end section other than the cutting edge of the throw away tip. (i) wherein the opening faces at least the area closer to the cutting edge than to an end section of the throw away tip other than the cutting edge or (ii) wherein the volume of the sealed space closer to the cutting edge is greater than the volume of the sealed space at the end section other than the cutting edge of the throw away tip.