In a rotating electrical machine, a field element includes a field element core to which magnets are fixed. The magnet has a pair of first acting surfaces opposing each other and through which a magnetic flux flows in or flows out, and a second acting surface serving as an inflow surface or an outflow surface for magnetic flux in a q-axis-side end portion. Between an acting surface on the armature side of the pair of first acting surfaces and the second acting surface, the magnet has a magnet magnetic path that extends from one acting surface to the other. The field element core has a q-axis-side portion adjacent in the circumferential direction to the acting surface of the magnet. A controller controls an energization phase of phases of an armature winding to cause a state of magnetic saturation of the q-axis-side portion of the field element core to be variable.