A switch device includes a circuit board disposed in a tubular holder case, a control button disposed for movement along the longitudinal directions of the holder case, the control button being actuated by pressing from outside of the switch device, and a switch unit mounted on the circuit board, the switch unit being actuated in response to rearward movement of the control button by pressing. A coil antenna is disposed rearwardly of the control button and has an outside diameter which is substantially the same as an outside diameter of the control button.