A button device for an electronic device, includes a panel defining an opening, a button module, and a switch. The button module has two opposite ends attached to the panel. A button is suspended at a middle of the button module and aligned with the opening of the panel. A triggering member is movable together with the button. The switch is remained a pre-determined distance from the panel, and out of alignment with the opening of the panel. The triggering member is laterally inserted between the switch and the panel for triggering the switch when the button is pressed.