A keyboard device for a computing device is provided. The computing device includes a first system module and a second system module. The keyboard device includes a keyboard module and at least two conductive sliding mechanisms. The keyboard module is installed on the first system module. The keyboard module includes a power supply unit. The power supply unit provides electric power for powering the keyboard module. The keyboard module is movable relative to the first system module through the conductive sliding mechanisms. Each conductive sliding mechanism includes a sliding base and a conductive member. The sliding base is installed on the keyboard module. The conductive member is electrically connected with the first system module and the keyboard module. When the sliding base is moved relative to the conductive member, the keyboard module is moved relative to the first system module.