Pressure control valve

A temperature sensing portion (311) of a control valve main body (310) is located in a first refrigerant passage (337) for communicating an outlet side of a radiator (200) with an inlet side of an internal heat exchanger (600), and a second refrigerant passage (338) for introducing the refrigerant flowing from the internal heat exchanger to an upstream side of a valve port (312) in a refrigerant flow is formed in a casing main body (332). Accordingly, since it is possible to reduce a delay of temperature change in a sealed space (control chamber) (311c) with respect to refrigerant temperature change at the outlet side of the radiator, a temperature response characteristic of the pressure control valve (300) is improved. Further, since it is not necessary to separately assemble a capillary tube, a temperature sensing cylinder or the like to the outlet side of the radiator, it is possible to reduce the number of processes for assembling the CO2 cycle and to attempt to reduce a manufacturing prime cost.