The present invention provides a gas-liquid separation device, a rear door, a cooling device, and a gas-liquid separation method capable of reducing the tank volume. A refrigerant vapor inflow portion 13a is provided in a heat receiving portion for recovering exhaust heat from a cooling object and into which refrigerant vapor flowing out from the heat receiving portion via the steam pipe 2 is introduced; The refrigerant gas outlet portion 13 b to be discharged, and among the refrigerant vapor, the tank 13 capable of storing the refrigerant liquid on the lower surface, the refrigerant liquid stored in the tank 13 floats on the steam pipe 2 and the tank 13 And a regulating valve 12 for closing the gap. [Selected figure] Figure 2
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