Abstract: In a torque measuring device having a shaft member bearing circumferentially circulating magnetic fluxes along its outer circumferential surface and adapted to measure a torque applied to the shaft member around its central axis by measuring a distortion of the magnetic fluxes caused by the torque according to an inverse magnetostriction, the shaft member has a principal cylindrical portion axially terminating in an annular end face perpendicular to the central axis, whereby a high density of magnetic fluxes corresponding to the axial length of the principal portion are generated to traverse the annular end face, so as to be detected by a magnetic field sensor to produce an output signal at a high S/N ratio.

Abstract: In the rare earth-iron-boron permanent magnet, Ce and La decrease the magnetic properties when used alone but synergistically enhance iHc when used in combination.The composition provided by the present invention is generally expressed by [(Ce.sub.x La.sub.1-x).sub.y R.sub.1-y ].sub.z [(Fe.sub.1-u-w Co.sub.w M.sub.u).sub.1-v B.sub.v ].sub.1-z with a proviso of 0.4.ltoreq.x.ltoreq.0.9, 0.2<y.ltoreq.1.0, 0.05.ltoreq.z.ltoreq.0.3, 0.01.ltoreq.v.ltoreq.0.3, 0.ltoreq.u.ltoreq.0.2, 0.ltoreq.w.ltoreq.0.5, and M is at least one element selected from the group consisting of Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni, W, Cu, and Ag.