Abstract: A rotary electric machine cooling structure includes a coolant passage that is provided on an outer circumferential part of a stator and that has a cylindrical shape substantially along an outer circumferential surface of the stator. The cooling structure includes a coolant inflow port, a coolant outflow port, and a plurality of heat release fins. The coolant inflow port is provided on one end side in an axial direction of the coolant passage. The coolant outflow port is provided on another end side in the axial direction of the coolant passage. The heat release fin protrudes outward in a radial direction from an inner circumferential surface in a radial direction inside the coolant passage. The heat release fin is arranged in a middle region in the axial direction of the coolant passage that is separated from the inflow port and the outflow port.