PROBLEM TO BE SOLVED: To provide a work vehicle for lowering an implement after finish of turning performed on an optional route on a field end, and for regulating lowering of the implement, when it is estimated that an operator does not expect lowering of the implement.SOLUTION: An implement lowering start region is set upon start of turning of a traveling machine body 2, and lowering of the implement is started, when the traveling machine body 2 reaches the implement lowering start region, and further lowering of the implement is regulated, when detecting any one of excess of a prescribed distance of a clearance between a position at the turning start time of the traveling machine body 2 and a present position of the traveling machine body 2 in the execution state, excess of a prescribed distance of an integrated travel distance of the traveling machine body 2, and excess of a prescribed angle of an angle formed by a direction of travel of the traveling machine body 2 at the turning start time and a direction of travel of the traveling machine body 2 on the present position.SELECTED DRAWING: Figure 19【課題】圃場端において任意の経路で行われる旋回の完了後に作業機を下降し、オペレータが作業機の下降を期待していないと推定されるときに作業機の下降を規制する作業車輌を提供する。【解決手段】走行機体2の旋回開始時に作業機下降開始領域を設定し、走行機体2が作業機下降開始領域に達すると作業機の下降を開始すると共に、走行機体2の旋回開始時の位置と実行状態での走行機体2の現在位置との離間距離の所定距離超過、走行機体2の積算走行距離の所定距離超過及び旋回開始時の走行機体2の進行方向と現在位置の走行機体2の進行方向とが成す角度の所定角度超過の少なくともいずれか一つを検知すると、作業機の下降が規制される。【選択図】図19
