A motor, comprising: a stator that comprises a stator core being ring-shaped and a plurality of teeth that protrudes radially inward from an inner peripheral surface of the stator core; coils wound around the teeth; a shaft that rotates around a rotation axis on a radial inner side of the stator core; a rotor core that is fixed to the shaft and takes the rotation axis as a radial center; magnets which are disposed on an outer peripheral surface of the rotor core and a radial thickness of which at end portions on both sides in a circumferential direction around the rotation axis is smaller than a radial thickness in a circumferential intermediate portion of the magnets; and salient poles that are formed between magnets adjacent in the circumferential direction of the outer peripheral surface of the rotor core and protrude radially outward from the circumferential end portions of the magnets, each salient pole of the rotor core is located between magnets adjacent in the circumferential direction and at the polar boundary of the magnetic poles of the magnets, wherein circumferential widths at end portions of the salient poles in a radial outer side is set to 40° or less in a form of an electrical angle, and a ratio between a number of magnetic poles of the magnets and a number of the teeth is set to 2: 3, wherein one groove is formed on an end surface of the salient poles on the radial outer side along the rotation axis direction, and the groove is formed in a manner that a groove width in the circumferential direction gradually decreases toward the radial inner side, and wherein a pair of salient pole side surfaces of the salient poles, which face end portions of the magnets in the circumferential direction, are formed parallel to each other on both side in the circumferential direction, and wherein, in a radial cross-sectional view, the magnets respectively have two corner portions, which are chamfered at faces facing the salient pole side surface, the corner portions are located at a radial outer side surface of the end portions of the magnets, and wherein a groove depth of the groove is set in a manner that a bottom of the groove is positioned on a straight line that connects the corner portions in the radial outer peripheral surface of the end portions of the two magnets clamping the salient pole from both sides. a stator that comprises a stator core being ring-shaped and a plurality of teeth that protrudes radially inward from an inner peripheral surface of the stator core; coils wound around the teeth; a shaft that rotates around a rotation axis on a radial inner side of the stator core; a rotor core that is fixed to the shaft and takes the rotation axis as a radial center; magnets which are disposed on an outer peripheral surface of the rotor core and a radial thickness of which at end portions on both sides in a circumferential direction around the rotation axis is smaller than a radial thickness in a circumferential intermediate portion of the magnets; and salient poles that are formed between magnets adjacent in the circumferential direction of the outer peripheral surface of the rotor core and protrude radially outward from the circumferential end portions of the magnets, each salient pole of the rotor core is located between magnets adjacent in the circumferential direction and at the polar boundary of the magnetic poles of the magnets, wherein circumferential widths at end portions of the salient poles in a radial outer side is set to 40° or less in a form of an electrical angle, and a ratio between a number of magnetic poles of the magnets and a number of the teeth is set to 2: 3, wherein one groove is formed on an end surface of the salient poles on the radial outer side along the rotation axis direction, and the groove is formed in a manner that a groove width in the circumferential direction gradually decreases toward the radial inner side, and wherein a pair of salient pole side surfaces of the salient poles, which face end portions of the magnets in the circumferential direction, are formed parallel to each other on both side in the circumferential direction, and wherein, in a radial cross-sectional view, the magnets respectively have two corner portions, which are chamfered at faces facing the salient pole side surface, the corner portions are located at a radial outer side surface of the end portions of the magnets, and wherein a groove depth of the groove is set in a manner that a bottom of the groove is positioned on a straight line that connects the corner portions in the radial outer peripheral surface of the end portions of the two magnets clamping the salient pole from both sides.