An apparatus for suspending a microwave oven, which includes a main body having a rear plate formed with a through hole thereon and a cooking chamber formed therein, comprises: a support plate mounted to a wall face to which the microwave oven is installed; a hooking member protruding toward the main body through the through hole of the rear plate from a planar surface of the support plate; a plate spring having one end portion fixed to the main body and the other end portion elastically deformable between a first position where the plate spring is disengaged from the hooking member and a second position where the plate spring is engaged with the hooking member; and an actuating member connected between the microwave oven and the plate spring for elastically deforming the plate spring between the first position and the second position. With this configuration, there is provided an apparatus for installing a microwave oven in suspension structure, allowing the microwave oven to be provisionally installed to the support plate with a simplified structure and a high coupling force.