To provide a dust collecting device for a vehicle, capable of efficiently collecting dust scattered as the vehicle travels.

A dust collecting port 5 is provided at a part of a vehicle behind the rear wheel, and the dust collecting port 5 is connected through a duct 4 to a dust collector 3 installed in a trunk. As the vehicle travels, a sirocco fan 14 is rotated by a motor 13 in the dust collector 3 to suck air from the dust collecting port 5. In the dust collector 3, a dust collecting bag 10 is housed, and sucked air passes through the dust collecting bag 10 to be discharged outward of the car. As the wheels rotate to scatter dust accumulated on the road, most of the dust is sucked through the dust collecting port 5 to the dust collector 3, thereby it is collected in the dust collecting bag 10.

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