TORQUE DETECTOR AND ELECTRIC POWER STEERING DEVICE USING THE SAME

There is provided a torque detection device capable of reliably preventing a holding ring from being attached to a stationary object in a direction opposite to an appropriate direction. There are included a magnetic flux collecting ring 5, arranged outside an outer periphery of a magnetic circuit forming member which is provided in a rotating body applied with a torque, for collecting a magnetic flux generated by the magnetic circuit forming member; a detector 6 for detecting the torque applied to the rotating body based on a density of the magnetic flux collected by the magnetic flux collecting ring 5; and a holding ring 7 for holding the magnetic flux collecting ring 5 and the detector 6 and including an attachment part 72 to be attached to a stationary object on an outer periphery on one side in a radial direction; wherein an attachment-preventing convex part 73 for preventing attachment to the stationary object by contacting the stationary object is formed on one end face in an axis line direction of the holding ring 7