To reduce the total cost required for the manufacture by unitizing a receiver and an expansion mechanism in a refrigeration cycle, and to easily connect or fit the parts to the refrigeration cycle without requiring an extensive fitting space.

In the refrigeration cycle including a compressor 24, a condenser 25, a receiver 22, an expansion mechanism 23, an evaporator 26, a charge valve, and a relief valve 82, the expansion mechanism 23 is unitized and integratedly fitted to a head part 37 of the receiver 22 provided with a receiver tank. In addition, other path than the compressor 24, the condenser 25 and the evaporator 26 are integratedly provided on the head part 37 of the receiver 22.