A rotating electric machine comprising: a rotor being supported and rotationally movable; a stator including an inner circumferential face opposing to an outer circumferential face of the rotor by means of a gap therebetween; a frame accommodating in an interior thereof the rotor and the stator, and also sealing in the interior a cooling fluid that cools the rotor and the stator; at least one cooling fluid duct (1a, 1b, 1c, 1d) mounted on a periphery of the frame, for communicating with an interior of the frame; and at least one cooling device (10a, 10b) placed in the at least one cooling fluid duct (1a, 1b, 1c, 1d), for cooling the cooling fluid; whereby the at least one cooling device (10a, 10b) includes a first end-face portion through which the cooling fluid flows into the at least one cooling device (10a, 10b), and a second end-face portion formed at a position opposing to the first end-face portion, for flowing the cooling fluid, being cooled, out of the at least one cooling device (10a, 10b); characterised in that at least one of the following first item (a) and second item (b) is included: (a) between the first end-face portion and the second end-face portion, at least one of the end-face portions (101, 102) is placed tilted with respect to a minimum-width's direction (DW, DW1, DW2) of the at least one cooling fluid duct (1a, 1b, 1c, 1d) in vicinity to the at least one cooling device (10a, 10b); and (b) between the first end-face portion and the second end-face portion, at least one of the end-face portions (101, 102) is placed tilted with respect to at least one of an inflow direction of the cooling fluid and an outflow direction of the cooling fluid. a rotor being supported and rotationally movable; a stator including an inner circumferential face opposing to an outer circumferential face of the rotor by means of a gap therebetween; a frame accommodating in an interior thereof the rotor and the stator, and also sealing in the interior a cooling fluid that cools the rotor and the stator; at least one cooling fluid duct (1a, 1b, 1c, 1d) mounted on a periphery of the frame, for communicating with an interior of the frame; and at least one cooling device (10a, 10b) placed in the at least one cooling fluid duct (1a, 1b, 1c, 1d), for cooling the cooling fluid; whereby the at least one cooling device (10a, 10b) includes a first end-face portion through which the cooling fluid flows into the at least one cooling device (10a, 10b), and a second end-face portion formed at a position opposing to the first end-face portion, for flowing the cooling fluid, being cooled, out of the at least one cooling device (10a, 10b); characterised in that at least one of the following first item (a) and second item (b) is included: (a) between the first end-face portion and the second end-face portion, at least one of the end-face portions (101, 102) is placed tilted with respect to a minimum-width's direction (DW, DW1, DW2) of the at least one cooling fluid duct (1a, 1b, 1c, 1d) in vicinity to the at least one cooling device (10a, 10b); and (b) between the first end-face portion and the second end-face portion, at least one of the end-face portions (101, 102) is placed tilted with respect to at least one of an inflow direction of the cooling fluid and an outflow direction of the cooling fluid. (a) between the first end-face portion and the second end-face portion, at least one of the end-face portions (101, 102) is placed tilted with respect to a minimum-width's direction (DW, DW1, DW2) of the at least one cooling fluid duct (1a, 1b, 1c, 1d) in vicinity to the at least one cooling device (10a, 10b); and (b) between the first end-face portion and the second end-face portion, at least one of the end-face portions (101, 102) is placed tilted with respect to at least one of an inflow direction of the cooling fluid and an outflow direction of the cooling fluid.