A permanent magnet embedded motor comprising a rotor core including a plurality of electromagnetic steel plates that are stacked therein, the rotor core being provided in a stator core, wherein the rotor core includes a plurality of first electromagnetic steel plates that are stacked in an axial direction, and a plurality of second electromagnetic steel plates, each of the first electromagnetic steel plates is provided with a plurality of magnet insertion holes that are made therein for inserting magnets therethrough constituting magnetic poles of the rotor core, and is provided with first voids that are formed at both circumferential ends of each of the magnet insertion holes, each of the second electromagnetic steel plates is provided with the magnet insertion holes, second voids that are formed at both circumferential ends of each of the magnet insertion holes, and projections that are formed at both circumferential ends of a radially inside surface of each of the magnet insertion holes so as to regulate a position of the magnets and so as to project from the radially inside surface to a radially outer direction, each of the second electromagnetic steel plates is stacked at at least one of axial direction ends of an electromagnetic steel plate group including each of the first electromagnetic steel plates, and when it is assumed that a length from an axial direction center of the stator core to an axial direction end of the stator core is L1 and a length form an axial center of the rotator core to the axial direction end is L2, then the L2 is larger than the L1. the rotor core includes a plurality of first electromagnetic steel plates that are stacked in an axial direction, and a plurality of second electromagnetic steel plates, a plurality of first electromagnetic steel plates that are stacked in an axial direction, and a plurality of second electromagnetic steel plates, each of the first electromagnetic steel plates is provided with a plurality of magnet insertion holes that are made therein for inserting magnets therethrough constituting magnetic poles of the rotor core, and is provided with first voids that are formed at both circumferential ends of each of the magnet insertion holes, is provided with a plurality of magnet insertion holes that are made therein for inserting magnets therethrough constituting magnetic poles of the rotor core, and is provided with first voids that are formed at both circumferential ends of each of the magnet insertion holes, each of the second electromagnetic steel plates is provided with the magnet insertion holes, second voids that are formed at both circumferential ends of each of the magnet insertion holes, and projections that are formed at both circumferential ends of a radially inside surface of each of the magnet insertion holes so as to regulate a position of the magnets and so as to project from the radially inside surface to a radially outer direction, the magnet insertion holes, second voids that are formed at both circumferential ends of each of the magnet insertion holes, and projections that are formed at both circumferential ends of a radially inside surface of each of the magnet insertion holes so as to regulate a position of the magnets and so as to project from the radially inside surface to a radially outer direction, each of the second electromagnetic steel plates is stacked at at least one of axial direction ends of an electromagnetic steel plate group including each of the first electromagnetic steel plates, and when it is assumed that a length from an axial direction center of the stator core to an axial direction end of the stator core is L1 and a length form an axial center of the rotator core to the axial direction end is L2, then the L2 is larger than the L1. is stacked at at least one of axial direction ends of an electromagnetic steel plate group including each of the first electromagnetic steel plates, and when it is assumed that a length from an axial direction center of the stator core to an axial direction end of the stator core is L1 and a length form an axial center of the rotator core to the axial direction end is L2, then the L2 is larger than the L1.