| 摘要 |
A differential gear device includes a case that rotates around a rotation center line; a first protruding portion protruding from an inner surface of the case toward the rotation center line; a rotatable first gear provided around the first protruding portion; and a second gear including a ring-shaped base portion, and a connection portion formed on an inner peripheral surface of the base portion, and connected to an output shaft, wherein the second gear engages with the first gear. One end of the base portion, which is located in the case at a position inside an opposite end of the base portion in an axial direction of the output shaft, is located in a region that is located directly ahead of the first protruding portion in a direction in which the first protruding portion protrudes.
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