PROBLEM TO BE SOLVED: To provide a work vehicle capable of avoiding execution of automatic steering control under an inappropriate condition.SOLUTION: The work vehicle includes: a travel device causing a travel machine body to travel; a seedling planting device capable of performing ground work; an automatic steering-control part 78 capable of changing over between an automatic-steering on state of causing the travel device to automatically steer the travel machine body such that the travel machine body travels along a target line on the basis of positioning information, and an automatic-steering off state of not automatically steering the travel device; a changeover operation tool 50 capable of changing over the automatic steering control part 78 from the automatic-steering off state to the automatic-steering on state on the basis of a manual operation; a determination part 79 determining presence/absence of an inappropriate condition for the ground work by the seedling planting device; and a changeover forbidding part 80, when the determination part 79 determines the presence of a condition, forbidding the changeover from the automatic-steering off state to the automatic-steering on state by the operation of the changeover operation tool 50.SELECTED DRAWING: Figure 4【課題】不適切な状況下で自動操向制御が実行されることを回避できる作業車を提供する。【解決手段】走行機体を走行させる走行装置と、対地作業を行うことが可能な苗植付装置と、測位情報に基づいて目標ラインに沿って走行機体を走行させるように走行装置を自動操向する自動操向オン状態と、走行装置を自動操向しない自動操向オフ状態と、を切り換え可能な自動操向制御部78と、自動操向制御部78を自動操向オフ状態から自動操向オン状態へ手動操作に基づいて切り換え可能な切換操作具50と、苗植付装置による対地作業に不適な条件の存否を判定する判定部79と、判定部79により条件が存在すると判定されている場合に、切換操作具50の操作による自動操向オフ状態から自動操向オン状態への切り換えを禁止する切換禁止部80と、が備えられている。【選択図】図4