A magnetic geared rotary electric machine comprising: a casing; a stator including a stator core fixed to the casing and formed in an annular shape centered on an axis, a coil installed inside a plurality of first slots of the stator core, and a plurality of stator magnets installed inside the stator core at intervals in a circumferential direction about the axis; a first rotor including a plurality of pole pieces provided radially inside the stator at intervals in the circumferential direction about the axis; and a second rotor including a rotor core provided radially inside the first rotor and a plurality of rotor magnets provided in the rotor core at intervals in the circumferential direction, wherein the stator core includes a back yoke surrounding the axis and a plurality of teeth formed on the back yoke at intervals in the circumferential direction, each of the plurality of teeth including a tooth body developing radially inward from the back yoke and a pair of tooth grasping portions (73, 73b) protruding radially from both circumferential ends at a radially inner section of the tooth body, wherein the coil is installed inside the first slots formed between the tooth bodies of the teeth adjacent to each other, and wherein the stator magnets are installed inside second slots, each second slot being formed between said pair of tooth grasping portions (73, 73b) of a respective tooth and wherein the stator magnets are further installed inside the first slots between the tooth grasping portions (73, 73b) of the different teeth adjacent to each other,, wherein the tooth grasping portions are configured to hold the stator magnets on a the radial inside of the coil within the first slots and on the radial inside of the tooth body within the second slots, respectively, and the stator magnet that is held on the radial inside of the coil and the stator magnet that is held on the radial inside of the tooth body are alternately arranged. a casing; a stator including a stator core fixed to the casing and formed in an annular shape centered on an axis, a coil installed inside a plurality of first slots of the stator core, and a plurality of stator magnets installed inside the stator core at intervals in a circumferential direction about the axis; a first rotor including a plurality of pole pieces provided radially inside the stator at intervals in the circumferential direction about the axis; and a second rotor including a rotor core provided radially inside the first rotor and a plurality of rotor magnets provided in the rotor core at intervals in the circumferential direction, wherein the stator core includes a back yoke surrounding the axis and a plurality of teeth formed on the back yoke at intervals in the circumferential direction, each of the plurality of teeth including a tooth body developing radially inward from the back yoke and a pair of tooth grasping portions (73, 73b) protruding radially from both circumferential ends at a radially inner section of the tooth body, wherein the coil is installed inside the first slots formed between the tooth bodies of the teeth adjacent to each other, and wherein the stator magnets are installed inside second slots, each second slot being formed between said pair of tooth grasping portions (73, 73b) of a respective tooth and wherein the stator magnets are further installed inside the first slots between the tooth grasping portions (73, 73b) of the different teeth adjacent to each other,, wherein the tooth grasping portions are configured to hold the stator magnets on a the radial inside of the coil within the first slots and on the radial inside of the tooth body within the second slots, respectively, and the stator magnet that is held on the radial inside of the coil and the stator magnet that is held on the radial inside of the tooth body are alternately arranged.