In a phase change cooling device that circulates a refrigerant liquid using a drive source, control is complicated if it is attempted to improve the reliability of the device, so the phase change cooling device of the present invention is a refrigerant liquid that receives heat from a heat source. An evaporator containing the refrigerant, a condenser for radiating the heat of the refrigerant vapor generated by the evaporation of the refrigerant liquid in the evaporator to produce the refrigerant liquid, refrigerant liquid driving means for circulating the refrigerant liquid, the evaporator and the condensation First piping portion connecting the condenser, second piping portion connecting the condenser and the refrigerant liquid driving means, third piping portion connecting the refrigerant liquid driving means and the evaporator, and second piping portion And one end is connected to the first pipe portion at the first connection point, and the other end is connected to the refrigerant storage means at the second connection point. And a fourth piping portion.
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