Abstract: Provided is a microwave oven. The microwave oven includes: a housing (1), a fan (2), a frequency converter (3), and a magnetron (4). The housing (1) has a cooking cavity inside the housing. The housing further has a mounting cavity (12) formed on the housing. The mounting cavity (12) includes a first mounting cavity (121) located at a rear side of the cooking cavity. The fan (2) is disposed in the first mounting cavity (121). The frequency converter (3) is disposed in the first mounting cavity (121). The magnetron (4) is disposed in the first mounting cavity (121). In a left-right direction of the housing (1), the fan (2) and the magnetron (4) are located at two sides of the frequency converter (3), respectively.