Sirocco fan and air-conditioner having the same

A sirocco fan includes: an impeller in which a plurality of first blades are formed on one of left and right faces of a main plate and a plurality of second blades are formed on the other of the left and right faces of the main plate; and a scroll housing covering the impeller, wherein the scroll housing includes air suction holes formed on both of left and right plates and a rounded portion formed to be convex in the opposite direction of the impeller on a scroll unit connecting both of the left and right plates, and an interval from the main plate to the rounded portion in a direction perpendicular to a rotation central axis of the impeller is the largest. A rapid change in the direction of air flowing to the scroll unit from the impeller can be minimized, and collision of air with the scroll unit is lessened, reducing a flow loss and enhancing efficiency.