The electromagnetic portion 23 is disposed on the outer periphery of the rotor core 20 and faces the stator 52. In the electromagnetic portion 23, a plurality of magnetic pole portions 30 are formed at equal intervals along a circumferential direction. Each magnetic pole portion 30 is constituted of three magnets 31 inserted into three magnet insertion holes 24 arranged in a substantially arc shape protruding radially inward. The magnet 31 is a permanent magnet such as a neodymium magnet. The magnetic pole portion 30 may be constituted of two magnets arranged in two magnet insertion holes arranged in a substantially V shape which opens outward in the radial direction or may be constituted of one flat magnet or arc magnet.

The cooling portion 22 includes first refrigerant flow path holes 25 arranged at equal intervals along the circumferential direction, and second refrigerant flow path holes 26 and third refrigerant flow path holes 27 alternately disposed along the circumferential direction between the adjacent first refrigerant flow path holes 25. That is, the second refrigerant flow path hole 26 is provided in relation to the first refrigerant flow path hole 25 on one circumferential side with respect to one first refrigerant flow path hole 25 and the third refrigerant flow path hole 27 is provided in relation to the first refrigerant flow path hole 25 on the other circumferential side.