In an air conditioner according to the present invention, a drain extraction unit and a refrigerant pipe connecting unit may be disposed in a blocking region in which a discharge port is not provided so that a size of the discharge port may be secured and the discharge port may be uniformly disposed, thereby generating uniform airflow in a room. In addition, in a lower housing formed in a circular shape, some of components inside an indoor unit of the air conditioner may be disposed in a protrusion portion that protrudes from the circular housing, so that the discharge port may be maximized and protrusion directions of a protrusion cover may coincide with each other, thereby facilitating the installation of the air conditioner. In addition, a condensate water collecting space that is disposed outside the housing may be provided in a drain tray, thereby efficiently preventing a leakage due to condensate water generated outside the housing. In addition, the housing, the drain tray, and the cover member of the air conditioner may be coupled by a coupling member coupled outside, thereby improving the durability of the indoor unit of the air conditioner.