Abstract: Disclosed is a heat pipe comprising: an evaporating section, a heat insulating section, a condensing section and a porous sintered powder wick structure, in which the wick structure comprises sub-structures different from one another in at least one selected from group including material, shape and particle size, each of the sub-structures being arranged into each of the evaporating, heat insulating and condensing sections, in which the wick structure has a biporous distribution made through sintering of a powder mixture having various particle sizes to increase porosity and permeability of the wick structure, and in which the heat pipe has an asymmetric cross sectional shape in a radial direction. Powder having a large particle size is readily inserted into the heat pipe to simplify manufacture of the heat pipe while thermal conductivity of the heat pipe is not degraded compared to a conventional structure which is not eccentric.