An exemplary electronic device includes a case, an inner body and a pivotable arm pivotally connected on the inner body by a pivot. The case defines an opening at a first lateral side thereof and a latching hole at a second lateral side thereof adjacent to the opening. The inner body is inserted in the case through the opening. The pivotable arm includes a frame engaged in the latching hole of the case, a latching member pivotally connected to the frame by the pivot, and a resilient member. The latching member includes an inner end and an outer end at opposite sides of the pivot. The outer end of the latching member is engaged in the latching hole. The resilient member abuts against the inner end of the latching member such that the inner end of the latching member biases the inner body.