A touchpad device includes a substrate, a circuit board, a connection plate, a resilient member, a triggering member, a first balance bar, a second balance bar, a first swing plate, and a second swing plate. The circuit board is disposed above the substrate and includes a trigger switch. The connection plate has a hollow hole corresponding to the trigger switch. The resilient member is disposed between the substrate and the circuit board. The triggering member corresponds to the hollow hole. The first balance bar is disposed between a first side of the connection plate and the substrate, and the second balance bar is disposed between a second side of the connection plate and the substrate. The swing plates are disposed between the substrate and the circuit board and are pressable to move with respect to the substrate, thereby driving the triggering member to move toward the trigger switch.