The second groove portion 44b is an annular concave groove which is continuous from the insertion hole 41 and has a radius D2 which is larger than the length from the center CL of the rotor 51 to the first refrigerant discharge hole 42a of the second end plate 40b. Therefore, the refrigerant supplied from the first refrigerant flow path hole 25 to the second groove portion 44b is discharged from the second refrigerant discharge hole 42b of the second end plate 40b as indicated by an arrow T2 in FIGS. 3 and 5. As indicated by an arrow T3 in FIG. 6, the refrigerant supplied from the first refrigerant flow path hole 25 to the second groove portion 44b is supplied to the second refrigerant flow path hole 26 of the rotor core 20 and flows through the second refrigerant flow path hole 26 in the axial direction from the second end plate 40b side to the first end plate 40a side, thereby cooling the magnet 31 disposed in each magnetic pole portion 30. The refrigerant which has flowed through the second refrigerant flow path hole 26 is discharged from the first refrigerant discharge hole 42a of the first end plate 40a as indicated by an arrow T4 in FIGS. 2 and 6.

The refrigerant discharge holes 42a and 42b of the first end plate 40a and the second end plate 40b both have a substantially triangular shape including an apex portion on the radially outer side. However, the shape of the refrigerant discharge holes 42a and 42b can be changed as appropriate.

[Stator]