Air conditioner for vehicle

An air conditioner for a vehicle comprising:

• an air conditioning unit disposed in a cabin of the vehicle to generate conditioned air;
• and
• a supply unit configured to supply the conditioned air generated by the air conditioning unit into the cabin, wherein
• the air conditioning unit includes a refrigeration cycle device having a compressor for compressing and discharging a refrigerant, a radiator for radiating heat of the refrigerant discharged from the compressor, a decompression device for decompressing the refrigerant passing through the radiator, and an evaporator for evaporating the refrigerant passing through the decompression device,
• a high-pressure refrigerant passage is defined from a refrigerant discharge side of the compressor to a refrigerant inlet side of the decompression device,
• one of the radiator and the evaporator functions as a use-side heat exchanger that generates the conditioned air by heat exchange between refrigerant and air,
• the refrigeration cycle device includes a high-pressure protection device configured to discharging the refrigerant to the outside when a pressure of the refrigerant flowing through the high-pressure refrigerant passage exceeds a predetermined reference pressure, and
• the high-pressure protection device is configured to discharge the refrigerant to the outside through an outside communication portion communicated with outside of the cabin.