An indoor unit of an air conditioner is provided to mount first and second blades in an outlet to rotate integrally for controlling wind discharge direction, wherein a wind discharge angle is properly controlled in cooling and heating operations for stable wind control. An indoor unit of an air conditioner includes a first blade(23) mounted in an outlet(6) rotatively for deflecting the direction of wind discharged via the outlet, and a second blade(25) mounted in the outlet with a distance from the first blade and extended to form a part of a discharge path, wherein the second blade rotates together with the first blade integrally. The outlet has a groove part(32) in a wall part(31) facing the first blade for increasing a distance from the first blade to the outlet.
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