An electric torque converter mounted on a parallel hybrid vehicle employing a parallel hybrid system, using both an internal combustion engine and an electric motor for propulsion, includes an electric motor generator having a motor generator rotor and a motor generator stator coil, and a composition-and-distribution mechanism located between the engine and a transmission for combining torque produced by the engine and torque produced by the motor generator with each other and for mechanically distributing the torque produced by the engine into the motor generator and a transmission input shaft. A converter case includes a third casing member formed with a boss portion supporting a rotating member of the composition-and-distribution mechanism by a bearing, and partitioning the motor generator from the composition-and-distribution mechanism. Also provided is a rotor support including a substantially cylindrical outer support portion supporting thereon the motor generator rotor, a substantially cylindrical inner support portion whose inner periphery is fixedly connected to the rotating member, and a connection portion interconnecting the inner and outer support portions. A locknut is located on the outer periphery of the rotating member and mates with a first one of axial ends of the substantially cylindrical inner support portion, for pre-loading the bearing via the rotor support. A position sensor includes a resolver rotor located on the inner periphery of the substantially cylindrical outer support portion, and a resolver stator located on the outer periphery of the boss portion.