Magnetic field measuring device comprising - a first semiconductor body with a surface, which is formed in a first x-y plane, as upper side, wherein the first semiconductor body has at the surface two mutually spaced apart magnetic field sensors (30, 40) arranged along a first connecting straight line and wherein the x direction, y direction and z direction are respectively formed orthogonally relative to one another, - a first magnet with a planar upper side formed in a second x-y plane and with a symmetry surface formed in a y-z plane, wherein the direction of magnetisation extends substantially or exactly parallel to the upper side and substantially or exactly parallel to the symmetry surface, - the first semiconductor body and the first magnet are fixed rigidly relative to one another, - the first semiconductor body is arranged to be translationally offset with respect to the first magnet in a x-y plane and wherein an offset, which is formed in z direction, between the first x-y plane and the second x-y plane is smaller than a thickness of the first magnet formed in the z direction, - the thickness of the magnet formed in the z direction extends from the upper side, which is formed in the second x-y plane, of the magnet in the direction of the first x-y plane and beyond the first x-y plane and - the two magnetic field sensors (30, 40) are spaced from one another in the x-z plane and are arranged in the x-z plane along a length dimension of the north pole or along a length dimension of the south pole, wherein - the planar upper side formed in the second x-y plane is a main length dimension surface of the magnet, - the magnetic field sensors (30, 40) each measure a z component of a magnetic field, - the magnetic field sensors (30, 40) in the case of a z component, which is asymmetrical with respect to the symmetry surface, of the magnetic field of the first magnet form signals different from one another so as to differentially measure the signals and - the x-y plane of the magnetic field sensors (30, 40) is arranged at half the thickness of the first magnet. - a first semiconductor body with a surface, which is formed in a first x-y plane, as upper side, wherein the first semiconductor body has at the surface two mutually spaced apart magnetic field sensors (30, 40) arranged along a first connecting straight line and wherein the x direction, y direction and z direction are respectively formed orthogonally relative to one another, - a first magnet with a planar upper side formed in a second x-y plane and with a symmetry surface formed in a y-z plane, wherein the direction of magnetisation extends substantially or exactly parallel to the upper side and substantially or exactly parallel to the symmetry surface, - the first semiconductor body and the first magnet are fixed rigidly relative to one another, - the first semiconductor body is arranged to be translationally offset with respect to the first magnet in a x-y plane and wherein an offset, which is formed in z direction, between the first x-y plane and the second x-y plane is smaller than a thickness of the first magnet formed in the z direction, - the thickness of the magnet formed in the z direction extends from the upper side, which is formed in the second x-y plane, of the magnet in the direction of the first x-y plane and beyond the first x-y plane and - the two magnetic field sensors (30, 40) are spaced from one another in the x-z plane and are arranged in the x-z plane along a length dimension of the north pole or along a length dimension of the south pole, wherein - the planar upper side formed in the second x-y plane is a main length dimension surface of the magnet, - the magnetic field sensors (30, 40) each measure a z component of a magnetic field, - the magnetic field sensors (30, 40) in the case of a z component, which is asymmetrical with respect to the symmetry surface, of the magnetic field of the first magnet form signals different from one another so as to differentially measure the signals and - the x-y plane of the magnetic field sensors (30, 40) is arranged at half the thickness of the first magnet.