An air conditioner includes: an air conditioning case having an air passage; a heat exchanger arranged to cross the air passage; a photocatalyst arranged on a surface of the heat exchanger; and an emitting portion which emits light for activating the photocatalyst. The photocatalyst decomposes odor component contained in air. The air conditioning case has a bent portion at upstream or downstream of the heat exchanger, so as to change a flowing direction of the air. The emitting portion is disposed on a wall part of the bent portion, and the wall part is located to oppose to the heat exchanger.