PROBLEM TO BE SOLVED: To provide a vehicle body-state switching structure for working vehicle, which can prevent the occurrence of misoperations, where the state of the vehicle body is unexpectedly switched into a second state at a working travel time, and to prevent the occurrence of inconvenience caused by the misoperation.SOLUTION: The vehicle body-state switching structure of the working vehicle is such that when an inclination angle of steering wheels 7, 12, detected by an inclination angle sensor 55 exceeds a set angle, a vehicle body state-switching means 48 switches the state of the vehicle body from the first state to the second state a steering speed-detecting means 86 for detecting the steering speed and a set angle-changing means 48E for changing the set angle are provided and the set angle is changed so that the set angle is increased, in response to the detected steering speed during the reaching of the set angle to a set upper limit angle, when the steering speed becomes low on the detection of the steering speed-detecting means 86 and also so that the set angle is reduced, in response to the detected steering speed during the reaching of the set angle to a set lower limit angle, when the steering speed is high.COPYRIGHT: (C)2009,JPO&INPIT【課題】 作業走行時において車体の状態が不測に第1状態から第2状態に切り換わる誤作動の発生を抑制し、その誤作動に起因した不都合の発生を抑制する。【解決手段】 切角センサ55が検出する操舵輪7,12の切れ角が設定角度を超えると、車体状態切換手段48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、操舵速度を検出する操舵速度検出手段86と、設定角度を変更する設定角度変更手段48Eとを備え、設定角度変更手段48Eが、操舵速度検出手段86の検出に基づいて、操舵速度が遅くなると、設定角度が設定上限角度に達するまでの間、検出された操舵速度に応じて設定角度が大きくなるように、また、操舵速度が速くなると、設定角度が設定下限角度に達するまでの間、検出された操舵速度に応じて設定角度が小さくなるように、設定角度を変更するように構成した。【選択図】 図5
