Abstract: A supercritical vapor compression cycle is provided having an improved cooling efficiency in the gas cooler, capable of automatically controlling the necessary circulating coolant quantity by adjusting the high side pressure. The supercritical vapor compression cycle comprises a compressor 1, a gas cooler (radiator) 2, a diaphragm resistor 4a, and evaporators, all of which is connected serially by a pipe 1 so as to form a closed circuit operated at the supercritical pressure at the high side, and further comprises a pressure control valve for controlling the pressure at the outlet of the gas cooler 2 so as to obtain the maximum performance factor of the supercritical vapor compression cycle, a reservoir 5, through which the pipe 6 from the outlet of the evaporator penetrates, for storing the liquid coolant 5a, and a communication pipe 5b communicating the bottom of the reservoir 5 with the pipe 6 connecting the pressure control valve with the diaphragm resistor.