An information input unit includes a carrying module disposed on a base and movable between a first position and a second position, and an input module disposed on and moveable along with the carrying module. The input module includes a touch-pad mechanism including a touch pad configured to be pressed to a pressed position and to generate a touch signal upon being touched, a resilient supporting mechanism resiliently supporting the touch pad to enable the touch pad to return to its original position from the pressed position, and a pressing mechanism disposed below the touch pad and configured to generate a pressing signal upon being pressed by the touch pad.