PURPOSE:To blow blowing air not providing any uncomfortable feeling to a human body while reducing noise by a method wherein the blowing area of an indoor blowing port is set to be larger than the opening area of a blowing duct and a striking wall for dispersing a blown flow from the blowing duct is provided. CONSTITUTION:As an indoor air circulation fan not shown is driven, indoor air is sucked from each of indoor air suction ports 22 set at an upper part and a lower part of an indoor panel 11. The indoor air passes through a suction passage 25 and a suction side duct 10a, the air is guided to an indoor heat exchanger not shown placed outside a room and is heat exchanged. The heat exchanged indoor air passes through a blowing duct 10b and is guided to an indoor panel 11. At this time, the indoor air strikes against a belt-like plate 27 acting as a striking wall disposed in a blowing passage 26. Due to this arrangement, the indoor air is dispersed upwardly, downwardly, rightwardly and leftwardly and then blown from an indoor air blowing port 23 into a room. Since the area of the blowing port of the indoor air blowing port 23 is set to be larger than the opening area of the blowing side duct 10b, the blown air is blown at a lower speed.