A rotating electric machine, comprising: a stator that includes a stator core and a stator winding wound at the stator core; and a rotor that is rotatably supported so as to rotate freely relative to the stator and includes a rotor core, with a plurality of magnetic poles formed at the rotor core and auxiliary salient poles formed for reluctance torque generation each between two successive magnetic poles set next to each other, wherein: each of the magnetic poles of the rotor comprises a magnet insertion hole formed at the rotor core, a permanent magnet that is inserted in the magnet insertion hole, and a nonmagnetic portion formed between the permanent magnet and an auxiliary salient pole; the permanent magnet is magnetized so as to achieve one polarity of N polarity and S polarity on a stator side thereof and achieve the other polarity on the opposite side wherein a magnetizing direction is reversed at every magnetic pole formed along a circumferential direction of the rotor; and at the rotor, a portion of the rotor core present over an area located toward the stator between the stator and the permanent magnet functions as a magnetic pole piece and a portion of the rotor core present over an area located toward the stator between the stator and the nonmagnetic portion functions as a bridge portion connecting the magnetic pole piece with the auxiliary salient pole; characterized in further comprising: a side of the nonmagnetic portion located toward the stator includes a first side at the bridge portion, extending from a side where the permanent magnet is present toward an auxiliary salient pole along a virtual circular arc centered on a rotational axis of the rotor and passing through the permanent magnet insertion hole at a position closest to the stator, and a side of the nonmagnetic portion located toward the auxiliary salient pole includes a second side extending further away from the stator, with the first side and the second side connected by a curved line; and the first side has a non-projecting circular form concentric to the virtual circular arc centered on the rotational axis of the rotor and passing through a point where a surface of the magnet insertion hole on its outer circumferential side and the first side intersect each other. a stator that includes a stator core and a stator winding wound at the stator core; and a rotor that is rotatably supported so as to rotate freely relative to the stator and includes a rotor core, with a plurality of magnetic poles formed at the rotor core and auxiliary salient poles formed for reluctance torque generation each between two successive magnetic poles set next to each other, wherein: each of the magnetic poles of the rotor comprises a magnet insertion hole formed at the rotor core, a permanent magnet that is inserted in the magnet insertion hole, and a nonmagnetic portion formed between the permanent magnet and an auxiliary salient pole; the permanent magnet is magnetized so as to achieve one polarity of N polarity and S polarity on a stator side thereof and achieve the other polarity on the opposite side wherein a magnetizing direction is reversed at every magnetic pole formed along a circumferential direction of the rotor; and at the rotor, a portion of the rotor core present over an area located toward the stator between the stator and the permanent magnet functions as a magnetic pole piece and a portion of the rotor core present over an area located toward the stator between the stator and the nonmagnetic portion functions as a bridge portion connecting the magnetic pole piece with the auxiliary salient pole; each of the magnetic poles of the rotor comprises a magnet insertion hole formed at the rotor core, a permanent magnet that is inserted in the magnet insertion hole, and a nonmagnetic portion formed between the permanent magnet and an auxiliary salient pole; the permanent magnet is magnetized so as to achieve one polarity of N polarity and S polarity on a stator side thereof and achieve the other polarity on the opposite side wherein a magnetizing direction is reversed at every magnetic pole formed along a circumferential direction of the rotor; and at the rotor, a portion of the rotor core present over an area located toward the stator between the stator and the permanent magnet functions as a magnetic pole piece and a portion of the rotor core present over an area located toward the stator between the stator and the nonmagnetic portion functions as a bridge portion connecting the magnetic pole piece with the auxiliary salient pole; a side of the nonmagnetic portion located toward the stator includes a first side at the bridge portion, extending from a side where the permanent magnet is present toward an auxiliary salient pole along a virtual circular arc centered on a rotational axis of the rotor and passing through the permanent magnet insertion hole at a position closest to the stator, and a side of the nonmagnetic portion located toward the auxiliary salient pole includes a second side extending further away from the stator, with the first side and the second side connected by a curved line; and the first side has a non-projecting circular form concentric to the virtual circular arc centered on the rotational axis of the rotor and passing through a point where a surface of the magnet insertion hole on its outer circumferential side and the first side intersect each other.