A switch device includes a housing, a substrate, a single operation knob including an operation plate having operation indications provided thereon and moving in a direction toward and away from the substrate, a push switch fixed to the substrate, a plurality of touch electrodes to mounted on the substrate for sensing proximity of a finger and outputting a proximity signal, and a control circuit configured to output a command signal to an electrical circuit based on proximity signals from the respective touch electrodes when a press signal is input thereto. The sensing portions of the touch electrodes are disposed so as to form a space between the sensing portions and the operation plate when the operation knob is not depressed by a finger, and to come close to the operation plate when the operation knob is depressed by a finger.