The purpose of the present invention is to more efficiently cool exhaust heat, of an apparatus or the like that emits heat, by preventing a situation where a gas-phase medium is cooled and turns into a liquid-phase medium and thereby transfer of the gas-phase medium is hindered. For this purpose, a cooling system includes a heat receiving means for receiving a gas heated by heat emitted by an electronic apparatus and changing a liquid-phase heat medium into a gas-phase heat medium. a heat radiation means for cooling the gas-phase heat medium so as to be changed into the liquid-phase heat medium. a first transfer means for transferring the gas-phase heat medium from the heat receiving means to the heat radiation means. and a second transfer means for transferring the liquid-phase heat medium from the heat radiation means to the heat receiving means. wherein at least part of the first transfer means is heated by the heat emitted by the electronic apparatus.