A connector 16 to be disposed on an outer peripheral surface of a valve body 11 having a cylindrical shape is provided with a leg portion 17 projecting radially outward of the valve body 11, a receptacle 18 formed along the outer peripheral surface of the valve body 11 from a tip part of the leg portion 17 and fittable to a mating connector, a plurality of terminals 21A, 21B embedded in the leg portion 17 and disposed along the outer peripheral surface of the valve body 11 in the receptacle 18, and a locking portion 24 disposed between the plurality of terminals 21A, 21B and configured to lock the mating connector.