An electronic device includes a body, a key switch and a limiting mechanism secured to the body. The body includes a top wall defining an aperture. The key switch includes a touch switch, an actuating member for actuating the touch switch when being pressed, and a key cap received in the aperture and abutting the actuating member. The limiting mechanism corresponds to the aperture. When the key cap is pressed, the actuating member is driven to actuate the touch switch, and the limiting mechanism limits the movement of the key cap to protect the touch switch from damages.