A housing of an electronic device includes a lower cover, a back panel secured to the lower cover, and a fixing mechanism for fixing the back panel to the lower cover. The fixing mechanism includes a fixing portion defining a latching hole, an inserting portion, a restricting portion, and an engaging portion defining a slot. The fixing portion and the inserting portion position on the back panel. The restricting portion and the engaging portion protrude from the lower cover. The inserting portion is capable of inserting into the slot, and the restricting portion is capable of locking in the latching hole, for cooperatively fixing the back panel to the lower cover.