Patent ID: 6895828

Claim:
A torque sensor comprising: a first magnetic shaft; a second shaft elastically rotatably connected to the first shaft; a nonmagnetic cylindrical magnetism leakage preventing member made of synthetic resin covering an outer periphery of the first shaft; a magnetic first detecting cylinder covering an outer periphery of the magnetism leakage preventing member; a magnetic second detecting cylinder integrally rotatable with the second shaft, one end of which is opposed to one end of the first detecting cylinder with a clearance; and a first coil constituting a first magnetic circuit by generating magnetic flux passing the one end of the first detecting cylinder and the one end of the second detecting cylinder, wherein a reluctance with respect to the passing magnetic flux in the first magnetic circuit is changed in accordance with an elastic relative rotational amount by a change in a transmitting torque of the first and second shafts, wherein the magnetism leakage preventing member is molded in a state that the first shaft is inserted into the first detecting cylinder, so that the first detecting cylinder and the first shaft are integrated to the magnetism leakage preventing member such that contact between the magnetism leakage preventing member and the first shaft prevents displacement of the magnetism leakage preventing member with respect to the first shaft in at least one of an axial direction and a circumferential direction.