A torque transmission device is provided that is capable of being compactified as much as possible in a direction of parallel arrangement of a pair of side gears while ensuring a differential function and a differential limiting function. The torque transmission device comprises side gears (5L, 5R) coupled to rear wheels (3L, 3R), a case (6) disposed on the outer circumferential side of the side gears (5L, 5R) and rotating around the axis of the side gears (5L, 5R), and a pinion gear (12) rotatably supported by the case (6) and engaged with the side gears (5L, 5R) in a straddling manner. Additionally, the side gears (5L, 5R) are made up of spur gears different in the number of teeth, the pinion gear (12) is a spur gear and is disposed with an axial direction thereof directed in the same direction as the axial direction of the side gears (5L, 5R), and the pinion gear (12) is associated with a motor (15).
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