PURPOSE: To obtain the titled heat pipe with excellent heat transfer capacity by a constitution wherein a turbine turned by a vapor working fluid and a pump driven by the turbine are arranged in a pipe body enclosing the working fluid while a liquid working fluid is circulated from inside of the cooling side end to the inside of the heating side end of the pipe body making use of the pump.

CONSTITUTION: When a heat pipe is set up for top heat mode, a vapor working fluid 24 flows rapidly from a heating unit to a cooling unit as the working fluid evaporates in the heating unit condensing in the cooling unit while a turbine 25 is turned by the vapor working fluid 24 passing through the turbine 25, resultantly driving a pump 29. Through these procedures, a liquid working fluid 21 condensed in the cooling unit is pressure-fed and returned to a liquid reservoir 22 in the heating unit further sucked up to the overall heating unit by means of wicks 23. Hereafter, the heat transfer is conducted continuously from the upper heating unit to the lower cooling unit while the working fluid 24 is circulated repeating evaporation and condensation thereof.