A permanent-magnet-embedded electric motor (1, 1a to 1c, 100) comprising: a stator configured by winding winding wires around teeth sections of stator cores, the teeth sections being provided between a plurality of slot sections opened to an inner circumference side; and a rotor rotatably arranged on an inner side of the stator with an air gap created between the rotor and the stator and said rotor embedded with permanent magnets respectively in a plurality of magnet insertion holes provided along a circumferential direction in an outer circumference section of a rotor core, each of the permanent magnets being embedded inside the rotor core wherein the teeth sections include: base sections formed by radial-direction extending sections extending in a radial direction and circumferential-direction sections connected to inner diameter sides of the radial-direction extending sections and extending in a circumferential direction; and characterised by increased magnetic-resistance sections (19a to 19g) provided at least at one end in the circumferential direction of the circumferential-direction extending sections and having magnetic resistance larger than magnetic resistance of the base sections, and given that a minimum interval in the circumferential direction between the base sections of adjacent teeth sections, from which are excluded the increased magnetic-resistance sections (19a,19b), is represented as La, a minimum gap in the circumferential direction between the base sections of adjacent teeth sections, which are included the increased magnetic-resistance sections (19a,19b), is represented as Lb, and the thickness of the air gap between the rotor core and the stator core is represented as Lg, a relation of La>2Lg>Lb holds. a stator configured by winding winding wires around teeth sections of stator cores, the teeth sections being provided between a plurality of slot sections opened to an inner circumference side; and a rotor rotatably arranged on an inner side of the stator with an air gap created between the rotor and the stator and said rotor embedded with permanent magnets respectively in a plurality of magnet insertion holes provided along a circumferential direction in an outer circumference section of a rotor core, each of the permanent magnets being embedded inside the rotor core wherein the teeth sections include: base sections formed by radial-direction extending sections extending in a radial direction and circumferential-direction sections connected to inner diameter sides of the radial-direction extending sections and extending in a circumferential direction; and characterised by increased magnetic-resistance sections (19a to 19g) provided at least at one end in the circumferential direction of the circumferential-direction extending sections and having magnetic resistance larger than magnetic resistance of the base sections, and radial-direction extending sections extending in a radial direction and circumferential-direction sections connected to inner diameter sides of the radial-direction extending sections and extending in a circumferential direction; and characterised by increased magnetic-resistance sections (19a to 19g) provided at least at one end in the circumferential direction of the circumferential-direction extending sections and having magnetic resistance larger than magnetic resistance of the base sections, and given that a minimum interval in the circumferential direction between the base sections of adjacent teeth sections, from which are excluded the increased magnetic-resistance sections (19a,19b), is represented as La, a minimum gap in the circumferential direction between the base sections of adjacent teeth sections, which are included the increased magnetic-resistance sections (19a,19b), is represented as Lb, and the thickness of the air gap between the rotor core and the stator core is represented as Lg, a relation of La>2Lg>Lb holds.