Air conditioner, a vehicle provided therewith and a control method for an air conditioner

In an air conditioner for a vehicle including a front pillar (13) which is disposed diagonally in front of a passenger and extends slant in a longitudinal direction of the vehicle, there are provided an air conditioning duct (46) disposed along the front pillar (13), a front-pillar conditioned-air blow-off port (47) which blows off conditioned air toward the passenger from the air conditioning duct (46), and a louver device (60) to be disposed at the front pillar (13) and deflect the conditioned air within an angle which is smaller than a slant angle of the front pillar (13), whereby the conditioned air from the louver device (60) can be blown off toward a neck portion and a head portion of the passenger. Thus, efficient air conditioning to a neck portion and its surroundings, which are sensitive to the passenger's air conditioning feeling, can be provided.