A work vehicle incudes a traveling mechanism (10) driven by a rotational power from an engine (20) and an implement (30) for effecting a ground work by the rotational power of the engine (20). The work vehicle further includes a load ratio calculation section (53) for calculating an engine load ratio indicative of an engine load of the engine, a ground speed calculation section (51) for calculating a ground speed of the vehicle body (1) with using satellite positioning data, a slip ratio calculation section (52) for calculating a slip ratio indicative of slippage of the traveling mechanism relative to a ground surface by using the ground speed, a traveling work control section (4) for creating an appropriate traveling work state by controlling a rotational speed of the engine (20) and a posture of the implement (30), and a traveling work management section (50) for outputting a state changing command that commands a change of the traveling work state, based on the engine load ratio and the slip ratio.
