HEAT TRANSPORT DEVICE

A heat transport device (1A) is provided with: a circulation path unit (10) in which a heat recovery unit (11) that vaporizing a heat transport medium and a condensation unit (12) that condenses the heat transport medium vaporized in the heat recovery unit (11) are incorporated, and which has a vacuum state; a branch path unit(20) which branches from the circulation path unit (10), and in which a valve (22) capable of controlling flow is incorporated; and an ECU (40A) which implements a first control unit and is configured to, when it is recognized that there is an increase in the pressure within the circulation path unit (10) under the same operating condition, open and close the valve (22) in the state in which the pressure within the circulation path unit (10) is higher than a predetermined pressure (±).