PURPOSE: To form the agricultural tractor of a low vehicular height at low cost by providing a space between the ends of an output axls and a wheel axle.

CONSTITUTION: A differential mechanism 1 is set in a differential case 2 in which output axles 4 supported by bearings 3 are horizontally projected to left and right directions. Left and right-handed first transmission cases 5 are attached to the left and right sides of the case 2, and the lower outsides of the cases 5 are attached with left and right-handed transmission cases 6 in an almost U-shaped fitting form with the cases 5 in such a way that spaces S are formed between the axles 4 and wheel axles 7. On the upper ends of the cases 6, the wheel axles 7 are provided projectionally toward the left and right outside in an overhung manner, and the output from the differential mechanism 1 is transmitted through transmission cases 5 and 6.