A refrigeration cycle comprising: a cooling medium circuit including a compressor, a condenser, an expansion apparatus, and an evaporator connected via a pipe, the cooling medium circuit circulating a cooling medium, the cooling medium circuit being suitable to be mounted in a vehicle; an internal heat exchanger including a first heat exchanging unit through which the cooling medium introduced from the condenser to the expansion apparatus flows and a second heat exchanging unit through which the cooling medium introduced from the evaporator to a suction side of the compressor flows, the internal heat exchanger performing a heat exchange of the cooling medium between the first heat exchanging unit and the second heat exchanging unit, the internal heat exchanger being disposed in a vehicle cabin when mounted to a vehicle. a connector through which a flow passage for the cooling medium between the condenser and the first heat exchanging unit and a flow passage for the cooling medium between the second heat exchanging unit and the compressor; and a seal component for blocking a through hole provided in a dash panel partitioning an engine room from a vehicle cabin, characterized in that the seal component has a peripheral wall part extending in a direction in which the through hole extends, wherein all or part of the connector is accommodated in an accommodation space partitioned by the peripheral wall part, and wherein all or part of the expansion apparatus has an outer shape accommodatable in the accommodation space, wherein the peripheral wall part of the seal component has a close contact part in close contact with the connector in a liquid-tight manner, and wherein the expansion apparatus has an outer shape capable of making close contact with the close contact part in a liquid-tight manner. a cooling medium circuit including a compressor, a condenser, an expansion apparatus, and an evaporator connected via a pipe, the cooling medium circuit circulating a cooling medium, the cooling medium circuit being suitable to be mounted in a vehicle; an internal heat exchanger including a first heat exchanging unit through which the cooling medium introduced from the condenser to the expansion apparatus flows and a second heat exchanging unit through which the cooling medium introduced from the evaporator to a suction side of the compressor flows, the internal heat exchanger performing a heat exchange of the cooling medium between the first heat exchanging unit and the second heat exchanging unit, the internal heat exchanger being disposed in a vehicle cabin when mounted to a vehicle. a connector through which a flow passage for the cooling medium between the condenser and the first heat exchanging unit and a flow passage for the cooling medium between the second heat exchanging unit and the compressor; and a seal component for blocking a through hole provided in a dash panel partitioning an engine room from a vehicle cabin, characterized in that the seal component has a peripheral wall part extending in a direction in which the through hole extends, wherein all or part of the connector is accommodated in an accommodation space partitioned by the peripheral wall part, and wherein all or part of the expansion apparatus has an outer shape accommodatable in the accommodation space, wherein the peripheral wall part of the seal component has a close contact part in close contact with the connector in a liquid-tight manner, and wherein the expansion apparatus has an outer shape capable of making close contact with the close contact part in a liquid-tight manner.