A rotating electric machine has a semiconductor magnetic sensor and a cylindrical housing with a cylinder part, which is made of a soft magnetic material, positioned closer to the semiconductor magnetic sensor relative to a back yoke of a stator core. The semiconductor magnetic sensor is positioned away from the cylindrical housing so that a shortest distance between a center of the semiconductor magnetic sensor and the cylindrical housing is equal to or greater than 50 times of a sum of a first space distance and a second space distance. With such an arrangement, a leak magnetic field generated by magnetic poles that leaks in an axial direction is prevented from disturbing the semiconductor magnetic sensor. Thus, a rotation position detection accuracy of the semiconductor magnetic sensor is improved.