Magnetic field sensor with Laplace force, this sensor comprising: - a substrate extending essentially in a plane called substrate plane, - at least one electrical conductor (8-13; 248-253; 292) suitable for an electrical current to flow through, this electrical conductor comprising a moving part (18; 292), suspended over the substrate, suitable for being displaced in a direction of displacement when it is subjected to a Laplace force, - mechanical links (20, 22; 296, 298) mechanically connecting this moving part to the substrate and electrically connecting the moving part to current power supply contact blocks arranged on the substrate, - at least one gauge (76, 102; 146, 148; 176; 202, 204; 264) suitable for measuring a physical quantity representative of the amplitude of the displacement of the moving part, this gauge comprising at least one first and one second parts (80, 82), - a suspended lever (52; 142; 172; 242; 312; 322; 348, 350) that can be rotationally displaced about an axis (60; 150) of rotation at right angles to the direction of displacement of the moving part, this lever comprising a first and a second distinct attachment points (50, 81), the first attachment point being mechanically connected to the moving part to transmit the displacement of the moving part to the lever in such a way as to drive the lever in rotation about the axis of rotation in response to a displacement of the moving part, and the second attachment point being directly mechanically connected to the first part of the gauge, characterized in that: - the sensor also comprises a hinge (66; 144; 174; 244) mechanically connecting the lever to the substrate, this hinge being distinct and separate from the mechanical links of the moving part and from the first and second attachment points, this hinge allowing the rotation of the lever about its axis of rotation, and - the lever is rigid to allow for a lever arm effect, and - the second part of the gauge is fixed with no degree of freedom to the substrate. - a substrate extending essentially in a plane called substrate plane, - at least one electrical conductor (8-13; 248-253; 292) suitable for an electrical current to flow through, this electrical conductor comprising a moving part (18; 292), suspended over the substrate, suitable for being displaced in a direction of displacement when it is subjected to a Laplace force, - mechanical links (20, 22; 296, 298) mechanically connecting this moving part to the substrate and electrically connecting the moving part to current power supply contact blocks arranged on the substrate, - at least one gauge (76, 102; 146, 148; 176; 202, 204; 264) suitable for measuring a physical quantity representative of the amplitude of the displacement of the moving part, this gauge comprising at least one first and one second parts (80, 82), - a suspended lever (52; 142; 172; 242; 312; 322; 348, 350) that can be rotationally displaced about an axis (60; 150) of rotation at right angles to the direction of displacement of the moving part, this lever comprising a first and a second distinct attachment points (50, 81), the first attachment point being mechanically connected to the moving part to transmit the displacement of the moving part to the lever in such a way as to drive the lever in rotation about the axis of rotation in response to a displacement of the moving part, and the second attachment point being directly mechanically connected to the first part of the gauge, - the sensor also comprises a hinge (66; 144; 174; 244) mechanically connecting the lever to the substrate, this hinge being distinct and separate from the mechanical links of the moving part and from the first and second attachment points, this hinge allowing the rotation of the lever about its axis of rotation, and - the lever is rigid to allow for a lever arm effect, and - the second part of the gauge is fixed with no degree of freedom to the substrate.