To provide a cooling technology of a loop-type heat pipe that can be applied to a cooled element having a large variation of a heat value.

A cooling system includes: an evaporator for receiving heat from a heating element to evaporate a working fluid; a condenser having a fin mounted to a pipe for radiating heat to the outside to condense the vapor of the working fluid; the loop-type heat pipe having a plurality of cooling fans which are separately arranged along a condensation part in parallel with one another; and a control device for giving an inclination to the number of the rotation of a plurality of cooling fan to preferentially cool the condensation part from an outlet side of the condensation part according to the heat value of the evaporator.