The invention relates to a domed contact component controlled by mechanical activation, which comprises an outer static conducting member (10), an inner static conducting member (12) and a resilient metal contact dome (18) which is in constant and static contact with the outer static conducting member (10). The dome (18) has a central contact part and a linking part, the periphery of which is electrically connected and mechanically linked to the outer static conducting member (10). The linking part comprises arms (22) having a portion (26) with elastic properties in the radial direction, and a stud (24) for fastening the outer static conducting member. Application to bank cards provided with keys.