An over-the-range microwave oven comprising: a housing defining an exterior; a cooking unit disposed in the housing; a duct unit disposed in the housing; a first panel forming a bottom surface of the duct unit; a pair of second panels disposed on two sides of the first panel and forming lateral side surfaces of the duct unit; characterized by an integrated duct module disposed on the first panel and comprising a plurality of electrical components associated with the duct unit, wherein the duct unit comprises: an upper duct unit disposed between the housing and the cooking unit and disposed on an upper side of the cooking unit, wherein the pair of second panels are disposed between the first panel and the housing, wherein an interval gap between the pair of second panels decreases along an air flow direction, and wherein further the duct module is disposed outside the pair of second panels; a third panel disposed on the rear of the pair of second panels and comprising an air inlet hole (313aa, 313ab), wherein the pair of second panels comprise: a pair of first portions respectively disposed on both sides of the third panel and in parallel to each other; a pair of inclined portions respectively extending from the pair of first portions, wherein a gap between the pair of inclined portions gradually decreases; and a pair of second portions respectively extending from the pair of inclined portions and disposed in parallel to each other, and wherein the integrated duct module comprises: a power source unit disposed on the first panel outside one of the pair of first portions; a running capacitor disposed on the first panel outside one of the pair of inclined portions; a noise filter disposed on the first panel outside one of the pair of second portions; and a fuse disposed on the first panel outside another one of the pair of first portions. a housing defining an exterior; a cooking unit disposed in the housing; a duct unit disposed in the housing; a first panel forming a bottom surface of the duct unit; a pair of second panels disposed on two sides of the first panel and forming lateral side surfaces of the duct unit; a pair of first portions respectively disposed on both sides of the third panel and in parallel to each other; a pair of inclined portions respectively extending from the pair of first portions, wherein a gap between the pair of inclined portions gradually decreases; and a pair of second portions respectively extending from the pair of inclined portions and disposed in parallel to each other, and wherein the integrated duct module comprises: a power source unit disposed on the first panel outside one of the pair of first portions; a running capacitor disposed on the first panel outside one of the pair of inclined portions; a noise filter disposed on the first panel outside one of the pair of second portions; and a fuse disposed on the first panel outside another one of the pair of first portions. a power source unit disposed on the first panel outside one of the pair of first portions; a running capacitor disposed on the first panel outside one of the pair of inclined portions; a noise filter disposed on the first panel outside one of the pair of second portions; and a fuse disposed on the first panel outside another one of the pair of first portions.