PROBLEM TO BE SOLVED: To prevent a vehicle from leaning into a dangerous state due to a traveling device stepping on a road surface, a depression in a field, or an embankment in a work vehicle that travels in a wasteland to perform work. SOLUTION: In a work vehicle traveling on a traveling device 2 under a traveling vehicle body 1, inner ground distance sensors B1, B2, B3, B4 are provided near four outer peripheral corners of the traveling device 2, and outside near four outer peripheral corners of the traveling vehicle body 1. Ground distance sensors A1, A2, A3, A4 are provided, and a predetermined step difference, which is the difference in ground height measured by the adjacent inner ground distance sensors B1, B2, B3, B4 and the outer ground distance sensors A1, A2, A3, A4. When the above is detected, the traveling safety device for the working vehicle notifies the user of a fall warning or controls the traveling device 2 to stop. [Selection diagram] Figure 1【課題】本発明では、荒れ地を走行して作業を行う作業車において、路面や圃場の窪みや盛土に走行装置が踏み込んで機体が傾いて危険な状態になることを防ぐことを課題とする。【解決手段】走行車体１下部の走行装置２で走行する作業車において、走行装置２の外周四隅近傍に内対地距離センサＢ１，Ｂ２，Ｂ３，Ｂ４を設けると共に走行車体１の外周四隅近傍に外対地距離センサＡ１，Ａ２，Ａ３，Ａ４を設け、隣接する内対地距離センサＢ１，Ｂ２，Ｂ３，Ｂ４と外対地距離センサＡ１，Ａ２，Ａ３，Ａ４が計測する地上高の差である段差が所定以上を検出すると、転倒警報として報知する或いは走行装置２を停止制御する作業車の走行安全装置とする。【選択図】図１
