An over-the-range microwave oven includes: a housing; a cooking unit which is disposed in the housing; an air discharge unit which includes an air discharge motor in the housing; an air discharge duct unit which discharges air through the air discharge unit; a cooling duct unit which guides outside air to the air discharge motor in order to cool the air discharge motor; and a duct unit in which the air discharge duct unit and the cooling duct unit are separated vertically.