The second end plate 40b is disposed to face the end surface on the other axial end side of the rotor core 20. The insertion hole 41 for inserting the rotor shaft 10 is formed in the center of the second end plate 40b. In a portion further on the outer side in the radial direction than the insertion hole 41, a plurality (six in the present embodiment) of second refrigerant discharge holes 42b are formed at equal intervals in the circumferential direction to overlap with the third refrigerant flow path holes 27 formed in the rotor core 20 when viewed from the axial direction.

Therefore, the first refrigerant discharge hole 42a provided to overlap the second refrigerant flow path hole 26 in the circumferential direction and the second refrigerant discharge hole 42b provided to overlap the third refrigerant flow path hole 27 in the circumferential direction are alternately arranged in the circumferential direction when viewed from the axial direction. The first refrigerant flow path hole 25 is disposed between the first refrigerant discharge hole 42a and the second refrigerant discharge hole 42b in the circumferential direction when viewed from the axial direction.

On the inner surface of the second end plate 40b, a second groove portion 44b is formed which communicates with the first refrigerant flow path hole 25, the second refrigerant flow path hole 26, and the third refrigerant flow path hole 27 of the rotor core 20 and communicates with the second refrigerant discharge hole 42b of the second end plate 40b.