It has been discovered that torque ripples can be reduced by adopting a shape such that: the width of a shoe connection formed on the stator of a permanent magnet motor is less than or equal to the thickness of core pieces constituting a stator core; and a relationship 0.7 <= Wm/(Tm*Gm) <= 3.3 is satisfied, where Wm is the length of the long side of a flat plate-shaped permanent magnet buried in the rotor, Tm is the length of the short side of the permanent magnet, and Gm is the maximum distance from the outer circumference of the rotor to the permanent magnet.