To provide a piping joint structure which raises the durability of the oscillation strength of the coolant piping and a refrigerating cycle unit for a vehicle.
In the piping joint structure, the coolant piping 32 vibrates in the axial direction within the limit from the first condition to the second condition and absorbs its vibration when an engine cooling module vibrates and the vibration is transmitted to the coolant piping 31 along with this vibration. In the first condition, the flange part 32d of the coolant piping 32 contact the flange part 31b of the coolant piping 31 and the flange part 32 contacts the stop part 50. In the second condition, the flange part 31b of the coolant piping 31a separates from the flange part 32d and the end side 31c of the receiving part 31a of the coolant piping 31 contacts the stop part 51.
Takahiro Miura
Fumihiro Mizuno