A heat-transporting device includes a working fluid, a vessel, a vapor-phase flow path, and a liquid-phase flow path. The working fluid transports heat using a phase change. The vessel seals in the working fluid. The vapor-phase flow path includes a first mesh member and causes the working fluid in a vapor phase to circulate inside the vessel, the first mesh member including a through-hole larger than a mesh thereof. The liquid-phase flow path causes the working fluid in a liquid phase to circulate inside the vessel.