Patent ID: 7500408

Claim:
A torque detection device comprising: a magnetic circuit forming member having a tubular magnet externally fitted and fixed to a first rotating body, and a magnetic ring that is located circumferentially of the tubular magnet and rotated together with a second rotating body connected to the first rotating body; a magnetic flux collecting ring part for collecting a magnetic flux generated by the magnetic circuit forming member; a detection part for detecting, based on a density of the magnetic flux collected by the magnetic flux collecting ring part, a torque applied to the first or second rotating body; and a first molded body that is positioned at a first end of the tubular magnet along a longitudinal direction of the first rotating body, the first molded body being integrally molded to an outer circumferential portion of the first rotating body that extends away from the first end of the tubular magnet in the longitudinal direction and to the first end of the tubular magnet so as to fix the tubular magnet to the first rotating body.