Abstract: A connector has a conductive terminal assembly including a plug-adaptable conductive terminal electrically connected with a circuit assembly and a pin holder for holding the conductive terminal The terminal assembly is sized to be able to be inserted from the front-end side of an outer shell case A cylindrical holding member has openings at both ends to enable the conductive terminal assembly to be inserted, a joint to position the conductive terminal assembly to itself, and is fixed from the rear-end side of the outer shell case. In addition, the detection coil assembly and the conductive terminal assembly are electrically connected with each other via a flexible connection member.