To provide a liquid circulating type cooling device wherein a water content transmission amount is reduced in a circulating system to make a reserve tank small in size, assembling into an enclosure can be eased and simplified in an electronic apparatus manufacturer, and maintenance work (exchange of CPU or the like, exchange of a device to be cooled) can be easily conducted.

The liquid circulating type cooling device is provided with a heat receiving body 9 that is connected with a heat generating device to convey a heat therefrom to a cooling liquid, a liquid circulation pump 11 to circulate the cooling liquid, a reserve tank 12 to pool the cooling liquid, a heatsink 13 to radiate the heat to the outside of an enclosure, and a liquid piping 15 that communicates respective members and wherein the cooling liquid circulates. The liquid piping 15 is formed by combining a flexible piping 17 and a metallic fixing piping 18.