An air conditioner for a vehicle including a case body having a floor outlet, a roof outlet, an evaporator, and a heater core; a mode door adjusting an opening amount of each of the vents; and a temp door adjusting an opening amount of a cold-air passage and a hot-air passage, includes: an actuator lever connected to an actuator provided in the case body, and a main lever connected to the actuator lever to simultaneously control the mode door and the temp door.