A stator frame includes a flow path which is formed spirally from one end side to the other end side in the axial direction of the stator frame between an inner circumferential surface and an outer circumferential surface while circling along a circumferential direction of the stator frame and within which a coolant is circulated, where a side wall portion which isolates the adjacent parts of the flow path, an inner wall portion which isolates the flow path from the inner circumferential surface of the stator frame and an outer wall portion which isolates the flow path from the outer circumferential surface of the stator frame are integrally formed.