Patent ID: 8810363

Claim:
An engine starting/stopping switch device comprising a switch unit that has a switch case and switches over switching modes in response to linear movement of a movable member which is housed in the switch case, a push button that is formed into a bottomed cylindrical shape with a front end thereof closed and is linked to the movable member so as to drive the movable member in response to a pushing operation, and a coil antenna that outputs transponder drive radio waves for generating an electromotive force in a transponder built into a portable device, placing the portable device in the vicinity of the push button enabling ID signal verification between the transponder and a vehicle to be carried out when the voltage of a battery built into the portable device is low, wherein the coil antenna is held in an antenna case which is connected to the switch case, said coil antenna being disposed coaxially with the push button so that at least part of the coil antenna is inserted into the interior of the push button.