The outer conductor is comprised of a first outer conductor (3) and a second outer conductor (4). The first outer conductor (3) and the second outer conductor (4) are connected to each other by attaching them to an insulating housing (1) and contacting the contact section (48) of the second outer conductor (4) to the first outer conductor (1). The backsides of the switching terminal (20) and the connecting terminal (21) are covered by a backside shielding section (43), and the lead section provided on the backside shielding section (43) is arranged between the lead section (20B) of the switching terminal (20) and the lead section (21B) of the connecting terminal (21).