The invention uses tunneling magnetoresistive elements as sensor devices for detecting biomagnetic signals and offsets external magnetic fields, etc. outside of the detection subject by means of multiple tunneling magnetoresistive elements. The invention is a magnetic sensor in which multiple assemblies are combined, the assemblies comprising tunneling magnetoresistive elements (10) that change the current flowing from a fixed magnetic layer to a free magnetic layer according to the angle between the orientation of the magnetization of the fixed magnetic layer and the orientation of the free magnetic layer magnetization. The assemblies are configured from: multiple tunneling magnetoresistive elements that are connected in series in an arrangement wherein the respective orientations of the fixed magnetic layer magnetizations and of the free magnetic layer magnetizations without an applied magnetic field coincide a capacitor connected in parallel to the multiple tunneling magnetoresistive elements and a fixed resistor connected in series to the multiple tunneling magnetoresistive elements and the capacitor. The magnetic sensor is configured by disposing the multiple assemblies with the orientations of the fixed magnetic layer magnetizations thereof being reversed with respect to each other with relative angles exceeding 90° and connecting same in series and/or in parallel.La présente invention utilise des éléments magnéto-résistifs à effet tunnel comme dispositifs capteurs pour la détection de signaux biomagnétiques et décale des champs magnétiques extérieurs, etc. à lextérieur de lobjet de détection au moyen de multiples éléments magnéto-résistifs à effet tunnel. Linvention concerne un capteur magnétique dans lequel des assemblages multiples sont combinés, les assemblages comprenant des éléments magnéto-résistifs à effet tunnel (10) qui changent le courant circulant depuis une couche magnétique fixe à une couche magnétique libre en fonction de langle entre lorientati
