Electrical contactor with touch control using a piezoelectric pellet incorporated in one face (2b) of a card (2) which is made of an insulating material and the other face (2a) of which comprises an electronic circuit, characterised in that said contactor comprises a metal casing (1), of which the bottom (5), which is thinned-down, constitutes a protective partition against which the first face (2b) is applied by the interposition of a tubular member (3), of which one end, which is elastically deformable, is applied against the periphery of the said card, the said casing and the said card comprising means which, together, bring about the holding of the said member (3) in position.