An electric rotating machine is provided. A tooth portion of a stator is divided into a first tooth portion and a second tooth portion that are movable relative to each other between a first position, in which a magnetic resistance between the first and second tooth portions is small, and a second position, in which the magnetic resistance is relatively large. In a state in which the second tooth portion is in the second position, a region from a stator yoke portion side end of a current-carrying winding disposed around the tooth portion to a rotor side end of a winding arrangeable region is divided into a first region and a second region. A current-carrying winding space factor in the first region is set to be relatively smaller than in the second region.