A work vehicle capable of suppressing theft while suppressing unintended notification. An output signal is received from a vibration sensor according to a vibration equal to or greater than a predetermined threshold when a changeover switch operated to switch between an ON state and an OFF state is in an ON state and a key switch is in an OFF state. , A security device 40 having a security control unit 41 for causing the notifying unit 39 to execute a notifying operation, and an adjusting unit capable of performing an adjusting operation for adjusting a predetermined threshold. [Selection diagram] FIG.【課題】意図しない報知を抑制しながら盗難の抑止を図ることが可能な作業車両を提供する。【解決手段】ＯＮ状態とＯＦＦ状態とに切替え操作される切替えスイッチがＯＮ状態かつキースイッチがＯＦＦ状態の際に、振動センサ４３からの所定の閾値以上の振動に応じた出力信号を受信したことに基づいて、報知手段３９に報知動作を実行させるセキュリティ制御部４１を有するセキュリティ装置４０と、所定の閾値を調節する調節操作が可能な調節手段と、を備える。【選択図】図４
