An air conditioner is disclosed. The disclosed air conditioner comprises: a housing which has an intake port and a discharge port, and is equipped with a first guide surface forming the discharge port and with a second guide surface facing the first guide surface; a heat exchanger which subjects the air, that has been taken in via the intake port, to heat exchange; a blower fan which takes in air from the intake port and causes same to pass through the heat exchanger and undergo heat exchange before then discharging same via the discharge port; and an air-flow control unit which is provided so as to be able to move between a first position, adjacent to that end of the discharge port from which the air is discharged, and a second position, distant from that end of the discharge port from which the air is discharged, and which projects from the first guide surface or the second guide surface of the housing when in the first position.