A wheeled work vehicle includes a traveling body including front and rear wheels, a traveling drive unit having an engine and a power transmission mechanism, a fuel tank, a work oil tank, and a vehicle frame mounting the front and rear wheels, the traveling drive unit, the fuel tank and the work oil tank. The vehicle includes a swivel base disposed upwardly of the traveling body and mounted via a swivel bearing on the traveling body, a driver's seat mounted on a rear portion of the swivel base, a steering unit disposed forwardly of the driver's seat and a ground-work implement supported on an implement support unit. The vehicle frame includes a front region mounting a front-wheel suspension unit for the front wheels, a rear region mounting a rear-wheel suspension unit for the rear wheels and an intermediate region supporting the swivel bearing.