PROBLEM TO BE SOLVED: To provide a means excelling in efficiency in taking in outside air by a radiator fan.SOLUTION: This driving part structure of a working vehicle includes the outside air intake radiator fan (26) that is arranged inside a machine body of a radiator (21) and can be switched into a normal rotating state and a non-driving state, and a dust exhaust fan (27) that is arranged inside the machine body of the radiator (21) and can be switched into a reverse rotating state and a non-driving state. The radiator fan (26) and the dust exhaust fan (27) are provided on the same axis, and the outside air intake capacity of the radiator fan (26) after switched into the normal rotating state from the non-driving state is set larger than the exhaust air capacity based on the inertia of the dust exhaust fan (27) after switched into the non-driving state from the reverse rotating state.
