Torque fluctuation inhibiting device, torque converter and power transmission device

A torque fluctuation inhibiting device for inhibiting torque fluctuations in a rotor to which a torque is inputted, the torque fluctuation inhibiting device comprising:

• a mass body disposed in alignment with the rotor in an axial direction, the mass body disposed to be rotatable with the rotor and be rotatable relative to the rotor, the mass body including a first inertia ring and a second inertia ring, the first and second inertia rings disposed in opposition to each other with the rotor interposed therebetween;
• a centrifugal element disposed to receive a centrifugal force to be generated by rotation of the rotor and the mass body;
• and
• a cam mechanism including a cam and a cam follower, the cam mechanism for converting the centrifugal force that acts on the centrifugal element into a circumferential force when a relative displacement is produced between the rotor and the mass body in a rotational direction, the circumferential force directed to reduce the relative displacement, the cam provided on the centrifugal element or one of the rotor and the mass body, the cam follower provided on the one of the rotor and the mass body or the centrifugal element.