PROBLEM TO BE SOLVED: To improve accuracy of vehicle speed information used in work machine control.SOLUTION: The work vehicle includes: a rotation sensor 40 detecting a rotation speed of a rotation shaft of a travel system； a travel control device 41 calculating a vehicle speed from a signal obtained from the rotation sensor 40； and a work machine control device 42 controlling a work machine mounted on the vehicle. The work vehicle transmits vehicle speed information calculated in the travel control device 41 to the work machine control device 42. The vehicle speed information is corrected according to a calculation result of the vehicle speed. When the vehicle speed is increased, a correction rate of the vehicle speed information is also increased. A four-wheel drive clutch is provided in a front wheel drive shaft transmitting rotation drive of en engine to a front wheel. A four-wheel drive sensor is provided detecting a connection state of the four-wheel drive clutch. When the four-wheel drive clutch is in a disconnected state and the vehicle is in two-wheel drive, the correction rate of the vehicle speed information is increased with respect to a time in four-wheel drive.SELECTED DRAWING: Figure 6【課題】作業機制御に用いる車速情報の精度を向上させる。【解決策】走行系の回転軸の回転速度を検出する回転センサ４０を設け、該回転センサ４０から得られた信号から車速を演算する走行制御装置４１と、車両に装着された作業機を制御する作業機制御装置４２とを有し、前記走行制御装置４１にて演算された車速情報を前記作業機制御装置４２に送信する作業車両において、車速の演算結果に応じて前記車速情報を補正する。また、車速が増加すると前記車速情報の補正率も増加させる。また、エンジンの回転駆動を前輪に伝達する前輪駆動軸に四輪駆動クラッチを設け、該四輪駆動クラッチの接続状態を検出する四輪駆動センサを設け、四輪駆動クラッチが非接続状態で、車両が二輪駆動である場合は、四輪駆動の時よりも前記車速情報の補正率を大きくする構成とする。【選択図】図６
