An air-conditioner for blowing out conditioned air independently to right and left sides. of a vehicle includes a unit casing, a cooling heat exchanger and a heating heat exchanger provided in the unit casing, a control device, and right and left conditioning units each having a front duct to blow out conditioned air toward a front seat, a rear duct to blow out conditioned air toward a front seat, and a front/rear switching door to switch between a front state where the conditioned air is blown out via the front duct to the front seat and a rear state where the conditioned air is blown out via the rear duct to the rear seat. The control device sets one of the front/rear switching doors to the front state and the other of the front/rear switching doors to the rear state.