An auxiliary keyboard comprises an insulating board and a plurality of conductive keys. The insulating board has a sheet having a plurality of portions respectively defining a plurality of thru holes, a plurality of resilient supporting portions respectively connected to the sheet correspondingly arranged to the thru holes, and a plurality of combined portions respectively connected to the resilient supporting portions. The thickness of each combined portion is about 0.05 mm to 1 mm. Each conductive key is defined by a bonded portion and an exposed portion. The bonded portions of the conductive keys are respectively and seamlessly coupled to the combined portions, and the exposed portions are arranged to allow exposure from the insulating board. Thus, the conductive keys are firmly fixed on the insulating board by the connection between each conductive key and each combined portion. The instant disclosure also provides an auxiliary input device.