PURPOSE: To make the titled air conditioner compact by a method wherein in the window type air conditioner provided with an indoor heat exchanger, an outdoor heat exchanger and a compressor which are encased in a single box, a centrifugal blower provided with a double-face sucking type impeller serving as an indoor blower and an outdoor blower at the same time is used.

CONSTITUTION: In the air conditioner provided with the indoor heat exchanger 1 and the outdoor heat exchanger 10 arranged adjacent to an indoor side opening and an outdoor side opening in the box 16, respectively, the impeller 2 is provided at the back of the indoor heat exchanger 1 so that the air in the room sucked from the direction (a) by the rotation of the impeller 2 is blown into the room from a blowout port 7 after it is introduced into a blowout casing 4. The impeller 2 has an extension 2' in the direction of the axis thereof so as to make the extension serve as the outdoor blower. As a consequence, the open air sucked from the direction (c) by the rotation of the extended impeller 2' is discharged outside the room after it is introduced into a blowout casing 4'. Further, a core plate 17 is provided between the impellers 2 and 2' such that the core plate 17 is supported on a common partition wall 18 separating the blowout casing 4 from the blowout casing 4', by means of receiving sections 19.