To provide an air conditioner for an automobile capable of efficiently arranging an internal heat exchanger and realizing an efficient operation.

A thermostatic expansion valve 5 is housed in a case 7 directly connected with a refrigerant outlet of an evaporator 6, and an inlet of the expansion valve 5 is connected with a piping for receiving liquid refrigerant with high pressure in the case 7. An outlet of the expansion valve 5 is connected with a refrigerant inlet of the evaporator 6, and an internal heat exchanger 4 for exchanging heats between high pressure refrigerant fed to the inlet of the expansion valve 5 and low pressure refrigerant returned from the case 7 to a compressor 1 is jointed between the case 7 and a pipe joint 9 installed to a fire wall 10.