The present invention relates to an indoor unit of an air conditioner, and more particularly, by installing an inverted triangular flow path at the lower end of the blower fan, the lower part of the blower fan is flat so that the suction air is not separated and sucked smoothly to the center of both sides of the blower fan. In addition, the present invention relates to a flow guide of an indoor unit of an air conditioner, in which a part of intake air forms a vortex at a lower surface of a blower fan, thereby preventing a flow loss and a noise increase. In other words, by installing a reverse triangular flow path guide having a certain length in the lower part of the blower fan and having first and second guide surfaces for separating the intake air smoothly on both sides, a smooth flow of the intake air can be achieved. It is possible to increase the air volume, and also to prevent the generation of vortex, thereby exhibiting the effect of reducing the discharge noise.
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