Thermally conductive pipe, heat treatment device, and treatment system

A thermally conductive pipe comprising:

• a pipe of which both end portions are closed;
• a working liquid that is sealed inside the pipe and vaporizes and liquefies;
• and
• a liquid transfer unit that exists along a longitudinal direction inside the pipe and transfers the liquefied working liquid at least in the longitudinal direction, wherein
• the liquid transfer unit has, in a case of being viewed in a cross section of the pipe, which is orthogonal to the longitudinal direction, a first liquid transfer unit that is formed of a net-shaped material made of a metal wire and is in contact with at least a partial range of an inner wall surface of the pipe and a second liquid transfer unit includes a plurality of wire rods made of metal or metal wires formed into a net shape where end portions of the metal rods or the metal wires are in direct contacts with the end portions of the pipe as the second liquid transfer unit is physically connected to both ends of the end portions, and
• the second liquid transfer unit is neither in direct nor in indirect contact with both the inner wall surface of the pipe and the first liquid transfer unit.