To provide a manufacturing method for a heat pipe simplified in a process for sealing an opening end part, and useful for shortening a working time and for reducing a cost.

In this heat pipe manufacturing method for manufacturing the heat pipe by sealing the opening end part after incorporating a heat transfer medium in through the opening end part of a hollow container in the hollow container, the process for sealing the opening end part comprises a bleeding step of bleeding an inside of the hollow container up to vacuum, a deformation working step of deforming at least one portion of the opening end part to form, in the opening end part, a closed portion continuous along a direction along which the heat transfer medium passes an inside of the opening end part, and a cutting and sealing step of cutting a midway of the closed portion continuous along the direction formed in the opening end part by the deformation working step with laser irradiation, and for welding a cut port to be sealed.