A magnetostriction-type torque sensor has a rotating shaft having
magnetostrictive properties and first and second coils which each
constitute three or more closed loops. For each coil, the closed loop is
disposed in a concentric relationship (a concentric circle located on a
plane perpendicular to the rotating shaft) with the rotating shaft.
Further, the direction of magnetostrictive properties of the rotating
shaft detected by the first coil is made different from the direction of
magnetostrictive properties of the rotating shaft detected by the second
coil.