An electric motor comprising: a rotor provided on a rotary shaft; and a stator fixed outside an outer peripheral surface of the rotor, the rotor including: a rotor core fixed to the rotary shaft so as to be rotatable together with the rotary shaft; and a plurality of permanent magnets embedded and fixed in the rotor core, wherein the permanent magnets extend in radial directions of the rotor and are spaced from each other in a circumferential direction of the rotor so that the permanent magnets adjacent to each other face each other, each of the permanent magnets has a uniform thickness and each of the permanent magnets is either bent from one end portion of the rotor to the other end portion of the rotor with respect to a direction of the rotary shaft of the rotor so that the permanent magnet has a triangular wave shape in which a plurality of linear portions are sequentially connected or is tortuous from one end portion of the rotor to the other end portion of the rotor with respect to a direction of the rotary shaft of the rotor so that the permanent magnet has a generally S shape in which a plurality of curved portions are sequentially connected, wherein each of the permanent magnets is magnetized in directions of normals to a surface of the permanent magnet so that poles of the same polarity face each other in the circumferential direction, magnetic pole-facing portions (41 a, 41 b) being magnetized so that the poles of one of the two polarities in the magnetic pole-facing portions (41a, 41b) in each permanent magnet face each other in the circumferential direction and so that the poles of the other polarity in the magnet pieces (24a, 24b) of adjacent permanent magnets face each other in the circumferential direction. a rotor provided on a rotary shaft; and a stator fixed outside an outer peripheral surface of the rotor, the rotor including: a rotor core fixed to the rotary shaft so as to be rotatable together with the rotary shaft; and a plurality of permanent magnets embedded and fixed in the rotor core, wherein the permanent magnets extend in radial directions of the rotor and are spaced from each other in a circumferential direction of the rotor so that the permanent magnets adjacent to each other face each other, each of the permanent magnets has a uniform thickness and each of the permanent magnets is either bent from one end portion of the rotor to the other end portion of the rotor with respect to a direction of the rotary shaft of the rotor so that the permanent magnet has a triangular wave shape in which a plurality of linear portions are sequentially connected or is tortuous from one end portion of the rotor to the other end portion of the rotor with respect to a direction of the rotary shaft of the rotor so that the permanent magnet has a generally S shape in which a plurality of curved portions are sequentially connected, wherein each of the permanent magnets is magnetized in directions of normals to a surface of the permanent magnet so that poles of the same polarity face each other in the circumferential direction, magnetic pole-facing portions (41 a, 41 b) being magnetized so that the poles of one of the two polarities in the magnetic pole-facing portions (41a, 41b) in each permanent magnet face each other in the circumferential direction and so that the poles of the other polarity in the magnet pieces (24a, 24b) of adjacent permanent magnets face each other in the circumferential direction. a rotor core fixed to the rotary shaft so as to be rotatable together with the rotary shaft; and a plurality of permanent magnets embedded and fixed in the rotor core, wherein the permanent magnets extend in radial directions of the rotor and are spaced from each other in a circumferential direction of the rotor so that the permanent magnets adjacent to each other face each other, each of the permanent magnets has a uniform thickness and each of the permanent magnets is either bent from one end portion of the rotor to the other end portion of the rotor with respect to a direction of the rotary shaft of the rotor so that the permanent magnet has a triangular wave shape in which a plurality of linear portions are sequentially connected or is tortuous from one end portion of the rotor to the other end portion of the rotor with respect to a direction of the rotary shaft of the rotor so that the permanent magnet has a generally S shape in which a plurality of curved portions are sequentially connected, wherein each of the permanent magnets is magnetized in directions of normals to a surface of the permanent magnet so that poles of the same polarity face each other in the circumferential direction, magnetic pole-facing portions (41 a, 41 b) being magnetized so that the poles of one of the two polarities in the magnetic pole-facing portions (41a, 41b) in each permanent magnet face each other in the circumferential direction and so that the poles of the other polarity in the magnet pieces (24a, 24b) of adjacent permanent magnets face each other in the circumferential direction.