PROBLEM TO BE SOLVED: To provide a vehicle body state-switching structure for working vehicle, which can prevent prolongation of the time required for switching the state of the vehicle body, from the start of a turning travel into the second state, prevent the occurrence of misoperations, where the state of the vehicle body is unexpectedly switched into a second state at a positioning travel time, and to prevent the occurrence of inconvenience caused by them.SOLUTION: The vehicle body-state switching structure of the working vehicle, constituted of an inclination sensor 55 for detecting the inclination angle, from a straight-ahead position of a steering wheel 7 and a vehicle body-state switching means 48 for switching the state of a vehicle body, on the basis of the detected result of the inclination sensor 55, wherein when the inclination angle detected by the inclination sensor 55 exceeds a set angle, the vehicle body-state switching means 48 switches the state of the vehicle body, from a first state to a second state, and is constituted of a set-angle changing means 48E for detecting the start of positioning travel for correcting the slippage of position, in the working travel route of the vehicle body and then changing the set position into a larger angle, according to the detected speed.COPYRIGHT: (C)2009,JPO&INPIT【課題】 旋回走行の開始から車体の状態が第2状態に切り換わるまでに要する時間が長くなることを抑制しながら、位置合わせ走行時に車体の状態が不測に第2状態に切り換わる誤作動の発生を抑制して、それらに起因した不都合の発生を抑制することにある。【解決手段】 操舵輪7の直進位置からの切れ角を検出する切角センサ55と、この切角センサ55の検出に基づいて車体の状態を切り換える車体状態切換手段48とを備え、切角センサ55により検出される切れ角が設定角度を超えると、車体状態切換手段55が、車体の状態を第1状態から第2状態に切り換えるように構成した作業車の車体状態切り換え構造において、車体の作業走行経路に対する位置ズレを修正する位置合わせ走行の開始を検知するとともに、その検知に基づいて設定角度を大きい角度に変更する設定角度変更手段48Eを備えてある。【選択図】 図5
