An air conditioner for a vehicle, having two or more evaporators (3, 4). The air conditioner has interior heat exchangers (5, 6) corresponding to the evaporators (3, 4), the first evaporator (3) is placed at a front part (8A) of the occupant compartment, and the second evaporator (4) is placed at a rear part (8B) of the occupant compartment and is connected to an interior heat exchanger (6) laid from the engine room (7) to the occupant compartment (8). The interior heat exchanger (6) has a triple tube structure in which a heat insulation section (15) is provided between heat exchange sections of a high-pressure refrigerant flow path (13) and a low-pressure refrigerant flow path (14).