An air conditioner for a vehicle includes an air-conditioning unit for supplying conditioned air into a vehicle, an information acquiring unit for acquiring state information indicating a state of the vehicle, a control information modifying unit having at least one probabilistic model for calculating the probability that a passenger will perform a predetermined setting operation, calculating the probability by inputting the state information into the at least one probabilistic model, and modifying the setting information or the control information related to the predetermined setting operation according to the probability so that the predetermined setting operation is performed, and an air-conditioning control unit for controlling the air-conditioning unit according to the modified setting information or modified control information.