A gear train (3; 203; 303; 303'; 403;) for a vehicle (1; 201; 301; 401;) and configured to transmit power from a rotating electrical machine (2; 202; 302; 402;) to a driving wheel (7A, 7B; 207A, 207B; 307A, 307B; 407A, 407B;) through a differential (5; 205; 305; 405;) and a drive shaft (6A, 6B; 206A, 206B; 306A, 306B; 406A, 406B;), the gear train (3; 203; 303; 303'; 403;) comprising: a plurality of shafts on a plurality of axes lying separately from each other; and a plurality of gears that is disposed respectively on the plurality of shafts, at least one of the plurality of gears being an internal gear, wherein the gear train (3; 203; 303; 303'; 403;) includes two or more speed reduction units (41, 42; 241, 242; 341, 342; 441, 442, 443;), each of the speed reduction units (41, 42; 241, 242; 341, 342; 441, 442, 443) provides a pair of gears included among the plurality of gears, the speed reduction units (41, 42; 241, 242; 341, 342; 441, 442, 443;) are configured to reduce speed of power from the rotating electrical machine (2; 202; 302; 402;) in a power transmission path leading from the rotating electrical machine (2; 202; 302; 402;) to the driving wheel (7A, 7B; 207A, 207B; 307A, 307B; 407A, 407B;), an external gear and an internal gear mesh with each other in at least one of the speed reduction units (41, 42; 241, 242; 341, 342; 441, 442, 443), the gear train includes at least a first speed reduction unit (41; 441) providing a first pair of gears and a second speed reduction unit (42; 442) providing a second pair of gears different from the first pair of gears, the first speed reduction unit and the second speed reduction unit each comprises an internal gear and an external gear, the internal gear and the external gear of the first speed reduction unit (41; 441) and the second speed reduction unit (42; 442) mesh with each other, the gears include a first gear provided on an output shaft of the rotating electrical machine, a second gear provided on the differential, and a third gear and a fourth gear that are provided on a shaft member disposed on an axis different from an axis of the output shaft and mesh with the first gear and the second gear, respectively, the first speed reduction unit provides the first gear and the third gear, the first gear being an external gear and the third gear being an internal gear, and the second speed reduction unit provides the second gear and the fourth gear, the second gear being an internal gear and the fourth gear being an external gear. a plurality of shafts on a plurality of axes lying separately from each other; and a plurality of gears that is disposed respectively on the plurality of shafts, at least one of the plurality of gears being an internal gear, wherein the gear train (3; 203; 303; 303'; 403;) includes two or more speed reduction units (41, 42; 241, 242; 341, 342; 441, 442, 443;), each of the speed reduction units (41, 42; 241, 242; 341, 342; 441, 442, 443) provides a pair of gears included among the plurality of gears, the speed reduction units (41, 42; 241, 242; 341, 342; 441, 442, 443;) are configured to reduce speed of power from the rotating electrical machine (2; 202; 302; 402;) in a power transmission path leading from the rotating electrical machine (2; 202; 302; 402;) to the driving wheel (7A, 7B; 207A, 207B; 307A, 307B; 407A, 407B;), an external gear and an internal gear mesh with each other in at least one of the speed reduction units (41, 42; 241, 242; 341, 342; 441, 442, 443), the gear train includes at least a first speed reduction unit (41; 441) providing a first pair of gears and a second speed reduction unit (42; 442) providing a second pair of gears different from the first pair of gears, the first speed reduction unit and the second speed reduction unit each comprises an internal gear and an external gear, the internal gear and the external gear of the first speed reduction unit (41; 441) and the second speed reduction unit (42; 442) mesh with each other, the gears include a first gear provided on an output shaft of the rotating electrical machine, a second gear provided on the differential, and a third gear and a fourth gear that are provided on a shaft member disposed on an axis different from an axis of the output shaft and mesh with the first gear and the second gear, respectively, the first speed reduction unit provides the first gear and the third gear, the first gear being an external gear and the third gear being an internal gear, and the second speed reduction unit provides the second gear and the fourth gear, the second gear being an internal gear and the fourth gear being an external gear.