An input device includes a cover and a base. The cover includes a button and a protrusion. The protrusion protrudes from the button. The base includes a processing unit and a button controlling module. The button controlling module includes a first magnetic member, a second magnetic member, and a movement sensing unit. The adjacent ends of the first magnetic member and the second magnetic member have the same polarity. The protrusion of the button contacts the first magnetic member. The movement sensing unit is for sensing the movement of the second magnetic member and for transmitting the sensed movement data of the second magnetic member to the processing unit. The processing unit determines the depressed button according to the sensed movement data of the second magnetic member.