Patent ID: 7950494

Claim:
A torque detecting device comprising: a housing that encloses the torque detecting device; magnetic flux concentrating rings which locate outside of a circumference of a magnetic circuit forming member provided in a rotating body to which a torque is exerted, the rings concentrating a magnetic flux generated by the magnetic circuit forming member; a detecting part which detects the torque exerted to the rotating body based on a density of the magnetic flux concentrated by the rings; and the housing includes a holding ring which holds the magnetic flux concentrating rings and the detecting part and includes an attachment part, which attaches to a stationary substance, on an outer circumference of the holding ring, wherein both end faces of the holding ring in an axial direction of the holding ring are parallel to each other, the attachment part includes a fitting groove in which a sealing ring, which seals a gap between the attachment part and the stationary substance, fits, and both end faces of the housing in the axial direction of the holding ring are flat except for position of the fitting groove, respectively.