An exemplary electronic device includes a housing, a lever, and a locking device securing the lever on the housing. The housing includes a bottom plate, a top plate and a side plate connecting the bottom plate with the top plate. The locking device includes a nut having a main body extending downwardly into the lever, a screw extending upwardly through the top plate into the nut, and elastically deformable gaskets sandwiched between the top plate and the nut. The lever is disposed on the top plate and sleeved on a pole of the nut. The lever is pressed by a head of the nut against the top plate.