PROBLEM TO BE SOLVED: To provide an automatic travel control system capable of accurately turning a work vehicle along a turning travel route. Kind Code: A1 An automatic travel control system for a work vehicle that automatically travels between an outer peripheral area formed in an outer peripheral area of a field and a work target area inside the outer peripheral area of the field, wherein a plurality of work target areas are provided in the work target area. A route setting unit that sets the work traveling route L and also sets a turning traveling route C that connects the ends of the work traveling route L in the outer peripheral region, and is provided in the work vehicle, and determines the position of the work vehicle using satellite navigation. A position detection module to be acquired, a steering control unit that controls the turning of the work vehicle so that the work vehicle travels along the turning travel route C, and a behavior determination unit that determines the traveling behavior of the work vehicle are provided. ing. The steering control unit determines the steering amount of the work vehicle based on the position and the traveling behavior. [Selection diagram] Fig. 11【課題】旋回走行経路に沿って作業車が精度よく旋回できる自動走行制御システムの提供。【解決手段】圃場における外周部に形成された外周領域と圃場における外周領域の内側の作業対象領域とを自動で走行する作業車のための自動走行制御システムであって、作業対象領域に複数の作業走行経路Ｌを設定するとともに、外周領域に作業走行経路Ｌの端部同士を繋ぐ旋回走行経路Ｃを設定する経路設定部と、作業車に設けられ、衛星航法を用いて作業車の位置を取得する位置検出モジュールと、作業車が旋回走行経路Ｃに沿って走行するように作業車の旋回制御を行う操向制御部と、作業車の走行挙動を判定する挙動判定部と、が備えられている。操向制御部は、位置と走行挙動とに基づいて、作業車の操向量を決定する。【選択図】図１１
