PURPOSE: An air conditioner for vehicles is provided to install a temporary assembly member temporarily assembling a gear shaft and a thin plate member to assemble the gear shaft and the thin plate member after the gear shaft and the thin plate member are assembled in a predetermined position. CONSTITUTION: An air conditioner for vehicles comprises a gear shaft, a thin plate member, and a temporary assembly member (160). The temporary assembly member temporarily assembles the gear shaft and the thin plate member to assemble the gear shaft and the thin plate member in an air conditioner case (110) after the gear shaft and the thin plate member are previously assembled in a predetermined position. The temporary assembly member includes a thin plate member support unit (161) and a tension unit (165). The thin plate member support unit is arranged in the other side of the gear shaft and supports the thin plate member. The tension unit is curved in both ends of the thin plate member support unit in a gear shaft direction and is assembled to be rotated with the gear shaft.