PROBLEM TO BE SOLVED: To set a set traveling line on a free course and reduce a burden on a driver. SOLUTION: A traveling machine body C capable of switching between manual traveling by manual steering and automatic traveling by automatic steering along a set traveling line SL set parallel to a reference traveling line KL, and manual traveling and automatic traveling. A switching operation tool 50 that is capable of switching between traveling and a start point setting unit 81 that sets a starting point S1 based on the position of the traveling machine body at the time of switching from manual traveling to automatic traveling by the switching operation tool 50. ing. [Selection diagram] Fig. 6【課題】自由なコースに設定走行ラインを設定でき、且つ、運転者への負担を減らす。【解決手段】手動操舵による手動走行と、基準走行ラインＫＬに平行に設定される設定走行ラインＳＬに沿って自動操舵により走行する自動走行と、を切替自在な走行機体Ｃと、手動走行と自動走行とを切替自在な切替操作具５０と、切替操作具５０によって手動走行から自動走行への切り替えを行った時点における走行機体の位置に基づいて始点Ｓ１を設定する始点設定部８１と、を備えている。【選択図】図６
