To provide a refrigerant circuit device that can save energy by storing and using a low temperature heat and a high temperature heat of a refrigerant.

The refrigerant circuit device includes a refrigerant circuit 10 in which an evaporator 14, a compressor 11, a condenser 12, and an expansion mechanism 13 are sequentially connected by a refrigerant pipe 15. The refrigerant circuit device is further provided with a high temperature heat transport unit 20 transporting a heat of a high temperature heat storage material by circulating an enclosed working fluid among a high temperature heat storage tank 16 storing a heat of the refrigerant compressed by the compressor 11 in a high temperature heat storage material, a low temperature heat storage tank 17 storing a heat of the refrigerant adiabatically expanded by the expansion mechanism 13 in a low temperature heat storage material, a high temperature heat obtaining part 21, and high temperature heat discharge parts 221 to 223, and a low temperature heat transport unit 30 transporting a heat of a low temperature heat storage material by circulating an enclosed working fluid among a low temperature heat obtaining part 31 and low temperature heat discharging parts 321 to 323.