A sensor comprising: - a first substrate made of conductive material with an outer side and an inner side, comprising: • an operative region deformable under the effect of a mechanical stress applied to the outer side, and • on the inner side of the operative region, a first transducer element, mobile under the effect of the operative region deformation; - a second substrate made of a conductive material with an outer side and an inner side directed towards the inner side of the first substrate, and comprising an operative region; - a second transducer element adapted to cooperate with the first transducer element to vary an electrical parameter between the first and the second transducer element under the effect of said mechanical stress; - a connection for fastening the first substrate to the second substrate, located out of the operative regions; - a first sensor terminal, electrically coupled to the first transducer element; and - a second sensor terminal, electrically coupled to the second transducer element, wherein, for at least one of the substrates: - the operative region extends in transverse direction in the thickness of the substrate, from one side to the other one of the latter; - the operative region is in the form of a closed-contour islet, physically and electrically isolated from the rest of the substrate, one of the sensor terminals being electrically connected to an islet; - between the operative region and the rest of the substrate, an interface is provided that comprises at least one peripheral lateral layer made of an electrically isolating material able to ensure both a mechanical fastening of the operative region to the substrate and an electrical insulation between the operative region and the substrate, the peripheral lateral layer being single-piece with the rest of the substrate and with the operative region, enveloping in the lateral direction the operative region over the whole periphery thereof, and extending in transverse direction over the thickness of the substrate. - a first substrate made of conductive material with an outer side and an inner side, comprising: • an operative region deformable under the effect of a mechanical stress applied to the outer side, and • on the inner side of the operative region, a first transducer element, mobile under the effect of the operative region deformation; • an operative region deformable under the effect of a mechanical stress applied to the outer side, and • on the inner side of the operative region, a first transducer element, mobile under the effect of the operative region deformation; - a second substrate made of a conductive material with an outer side and an inner side directed towards the inner side of the first substrate, and comprising an operative region; - a second transducer element adapted to cooperate with the first transducer element to vary an electrical parameter between the first and the second transducer element under the effect of said mechanical stress; - a connection for fastening the first substrate to the second substrate, located out of the operative regions; - a first sensor terminal, electrically coupled to the first transducer element; and - a second sensor terminal, electrically coupled to the second transducer element, - the operative region extends in transverse direction in the thickness of the substrate, from one side to the other one of the latter; - the operative region is in the form of a closed-contour islet, physically and electrically isolated from the rest of the substrate, one of the sensor terminals being electrically connected to an islet; - between the operative region and the rest of the substrate, an interface is provided that comprises at least one peripheral lateral layer made of an electrically isolating material able to ensure both a mechanical fastening of the operative region to the substrate and an electrical insulation between the operative region and the substrate,