Abstract: A heat pipe includes an external cylinder extending in an axial direction, an internal cylinder provided inside the external cylinder so as to extend in the axial direction, and a wick provided between and integrally with the external cylinder and the internal cylinder. The wick includes a plurality of micro through portions extending linearly in the axial direction. According to this configuration, a working fluid moves smoothly in the axial direction without being blocked, and thus it is possible to provide a heat pipe having a further improved heat exchange performance.