To provide a vehicular refrigeration cycle device capable of improving heat exchanging efficiency without increasing an amount of coolant.

A coolant pipe 10 which connects an evaporator 8, an expansion valve 7, a compressor 5, and a condenser 6 in a circulating manner across inside and outside of a vehicle room comprises at least a high-pressure liquid pipe section 12 connecting the condenser 6 and the expansion valve 7 and through which high-pressure liquid coolant passes, and a low-pressure gas pipe section 14 connecting the evaporator 8 and the compressor 5 and through which low-pressure gas coolant passes. A high-pressure liquid pipe exterior section 12a positioned at the outside 3 (engine room) of the vehicle room in the high-pressure liquid pipe section 12 is arranged adjacent to a low-pressure gas pipe exterior section 14a positioned at the outside 3 of the vehicle room in the low-pressure gas pipe section 14, while forming a clearance 15 between them. Further, a dew condensation water transmitting member 20 is provided for transmitting dew condensation water generated on a surface of the low-pressure gas pipe exterior section 14a to a surface of the high-pressure liquid pipe exterior section 12a.

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