The depth-wise length of each lateral air-direction changing blade (14), which is provided on an indoor unit of an air conditioner and laterally changes the direction of air blown out from an outlet, is made longer than the depth-wise length of the front wall (32) of an air passage (28) formed downstream of a fan (8). By extending the length of each lateral air-direction changing blade, the area of each blade can be increased and the capability to change the air direction laterally can be improved.