To achieve highly air-tight and highly durable waterproofing by using a packing structure that follows an operating site in a pressed contact structure using a spring or the like.

This is a movable contact terminal 2 that moves toward axial line direction by electric coupling with other equipment, which is equipped with a diaphragm-like elastic sealing member 3 composed of a thin-walled elastic movable part 31 that is adhered to this movable contact terminal 2 and follows the movement of the movable contact terminal 2 toward the axial line direction to be elastically deformed, and an elastic wall face part 33 to surround the surrounding of this elastic movable part 31.