PURPOSE: To reduce in size a refrigerant supplying system for cooling a board having a heat generation component in the system for supplying refrigerant to be used in the case of cooling the component mounted on the board.

CONSTITUTION: A refrigerant supplying system supplies refrigerant for cooling heat generation components 4 mounted on a board 1, and comprises a cold plate 2 connected to the board 1 to heat exchange with the components 4, a tank 5 for storing the refrigerant, and a pump 10 for quantitatively discharging the refrigerant. The system further comprises a panel-like heat dissipating plate 6 having a water channel 7 for dissipating heat of the refrigerant raised at its temperature by cooling the components 4, and tubes 3 for connecting the tank 5, the pump 10 to the plate 6, the plate 2.