A switch device has a casing, a tubular portion provided on the casing, an upper surface and a lower surface of the tubular portion being opened, a support shaft provided in the tubular portion, a manipulation knob attached to the tubular portion such that an opening in the upper surface is covered therewith, the manipulation knob being turned about the support shaft by manipulation, a first hitting portion provided in the manipulation knob, a first hit portion provided in the tubular portion, the first hitting portion hitting the first hit portion when the manipulation knob is turned to reach a limit of an operating range of a turning operation of the manipulation knob, and a second hitting portion provided in the manipulation knob independently of the first hitting portion.