A dynamo-electric machine comprising: a cylindrical frame; a cylindrical stator fixed to an inside of the frame; a cylindrical rotor provided inside the stator such that a gap is formed between the rotor and the stator; a rotation shaft fixed to the rotor so as to penetrate an inside of the rotor; and a bracket fixed to the frame and rotatably supporting the rotation shaft, wherein ducts are radially formed at the stator at a middle portion in axial direction of the stator so as to directly communicate with the gap, the frame has first supply openings through which cooling air flow is supplied in the frame at both end sides in axial direction of the frame, exhaust openings through which cooling air flow in the frame is exhausted to an outside of the frame at both end sides in axial direction of the frame and the cooling air flow through said second supply openings is supplied to the ducts of the stator, wherein the second supply openings are arranged opposite each other on the peripheral surface of the frame, the dynamo-electric machine further comprises cooling-water pipes (21A, 21B) provided as a pair at one end side and the other end side of the middle in the axial direction of the frame, wherein the cooling-water pipes (21A, 21B) have, at the middle in the axial direction of the frame, inlets (21Aa, 21Ba) through which cooling water is supplied to the cooling-water pipes (21A, 21B) and have, at the axial direction both end sides of the frame, outlets (21Ab, 21Bb) through which the cooling water is exhausted from the cooling-water pipes (21A, 21B), the second supply openings are located between the inlets (21Aa, 21Ba) of the both cooling-water pipes (21A, 21B), whereby cooling air flow being supplied from the second supply openings, flows in the ducts of the stator while cooling the stator from the middle portion and reaches the gap. a cylindrical frame; a cylindrical stator fixed to an inside of the frame; a cylindrical rotor provided inside the stator such that a gap is formed between the rotor and the stator; a rotation shaft fixed to the rotor so as to penetrate an inside of the rotor; and a bracket fixed to the frame and rotatably supporting the rotation shaft, wherein ducts are radially formed at the stator at a middle portion in axial direction of the stator so as to directly communicate with the gap, the frame has first supply openings through which cooling air flow is supplied in the frame at both end sides in axial direction of the frame, exhaust openings through which cooling air flow in the frame is exhausted to an outside of the frame at both end sides in axial direction of the frame and the cooling air flow through said second supply openings is supplied to the ducts of the stator, wherein the second supply openings are arranged opposite each other on the peripheral surface of the frame, the dynamo-electric machine further comprises cooling-water pipes (21A, 21B) provided as a pair at one end side and the other end side of the middle in the axial direction of the frame, wherein the cooling-water pipes (21A, 21B) have, at the middle in the axial direction of the frame, inlets (21Aa, 21Ba) through which cooling water is supplied to the cooling-water pipes (21A, 21B) and have, at the axial direction both end sides of the frame, outlets (21Ab, 21Bb) through which the cooling water is exhausted from the cooling-water pipes (21A, 21B), the second supply openings are located between the inlets (21Aa, 21Ba) of the both cooling-water pipes (21A, 21B), whereby cooling air flow being supplied from the second supply openings, flows in the ducts of the stator while cooling the stator from the middle portion and reaches the gap.