To provide a pipe cutter having a constitution for surely preventing a danger of ignition by frictional heat.

This pipe cutter has a cutter body 1 for successively cutting a cutting object pipe P over the whole periphery by rotatably driving the cutter while revolving along the outer periphery of the cutting object pipe, and is characterized by having the constitutions 12 and 12' for respectively supplying cooling liquid to a cutting portion in the leading object pipe P, a blade of the cutter for cutting in this place and the cutter 6 except for this place.