A space-environment dedicated cooling device includes a first flow path to which coolant to be cooled is fed, a second flow path thermally coupled to the first flow path and a water absorbing body which is exposed to the space environment when the cooling device is used in the space environment. The second flow path is fed with feedwater. The water absorbing body is fed with the feedwater from the second flow path. The water absorbing body includes a water absorbing member made of water-absorbing material.