Air conditioner of vechile

A vehicle air conditioner is provided to reduce assembling work for setting a cam by integrating an element for initial setting of a cam into a cam and a case without using any additional fixing pins, thereby reducing the manufacturing cost thereof. A vehicle air conditioner includes a case(1) formed with a positioning protrusion(11) on an outer surface corresponding to a cam(3), and the cam formed with a receiving part(20) to be inserted by the protrusion, so that the initial assembling positions of the cam and the case are kept. As the cam rotates, the protrusion is deviated from the receiving part by an idle part(21) not to interfere the cam.