PROBLEM TO BE SOLVED: To deteriorate or damage a fuel cell performance due to air withering at a cathode electrode without lowering the responsiveness of the power generation output of the fuel cell to a power load in a work vehicle using the generated power of the fuel cell as a power source. Providing technology that can suppress. SOLUTION: An increase in the power load of a fuel cell is predicted based on a work start detection unit that detects a work start operation for changing the posture of a work machine from a non-work posture to a work posture and a detection result of the work start detection unit. A target oxidant gas supply amount when the oxidant gas supply control unit determines that the load increase determination unit is in a load increase state, including a load increase determination unit for determining whether or not the load is in an increase state. Is set to be larger than when the load increase determination unit determines that the load is not in the increased state. [Selection diagram] FIG. 8【課題】燃料電池の発電電力を動力源とする作業車両において、電力負荷に対する燃料電池の発電出力の応答性を低下させることなく、カソード電極での空気枯れに起因する燃料電池の性能低下や損傷を抑制できる技術を提供する。【解決手段】作業機の姿勢を非作業姿勢から作業姿勢へ変更させる作業開始操作を検知する作業開始検知部と、作業開始検知部の検知結果に基づいて燃料電池の電力負荷の増加が予測される負荷増加状態であるか否かを判定する負荷増加判定部と、を備え、酸化剤ガス供給制御部が、負荷増加判定部で負荷増加状態であると判定したときの目標酸化剤ガス供給量を、負荷増加判定部で負荷増加状態でないと判定したときよりも大きく設定する。【選択図】図８
