A hybrid work vehicle, comprising: an engine ; an electric motor ; a vehicle body frame ; an outer cover ; an engine compartment internally housing the engine ; a cooling compartment internally housing a cooling device ; a partition wall separating the cooling compartment from the engine compartment ; an inverter disposed between the partition wall and the cooling device ; and a capacitor disposed between the partition wall and the cooling device ; wherein: driving force is generated by the engine and by the electric motor ; characerized in that the cooling device includes a hybrid cooler , which cools cooling water of the inverter and the capacitor ; the capacitor is supported upon the vehicle body frame ; the inverter is positioned above the capacitor ; a length of the inverter in the vehicle width direction is shorter than a length of the capacitor in the vehicle width direction; at least one of a first side surface of the outer cover positioned leftwards from a left side surface of the inverter , and a second side surface of the outer cover positioned rightwards from a right side surface of the inverter is separated from the inverter by a gap; and the inverter is installed as separated from the capacitor in the vertical direction by a gap. an engine ; an electric motor ; a vehicle body frame ; an outer cover ; an engine compartment internally housing the engine ; a cooling compartment internally housing a cooling device ; a partition wall separating the cooling compartment from the engine compartment ; an inverter disposed between the partition wall and the cooling device ; and a capacitor disposed between the partition wall and the cooling device ; wherein: driving force is generated by the engine and by the electric motor ; characerized in that the cooling device includes a hybrid cooler , which cools cooling water of the inverter and the capacitor ; the capacitor is supported upon the vehicle body frame ; the inverter is positioned above the capacitor ; a length of the inverter in the vehicle width direction is shorter than a length of the capacitor in the vehicle width direction; at least one of a first side surface of the outer cover positioned leftwards from a left side surface of the inverter , and a second side surface of the outer cover positioned rightwards from a right side surface of the inverter is separated from the inverter by a gap; and the inverter is installed as separated from the capacitor in the vertical direction by a gap. driving force is generated by the engine and by the electric motor ; characerized in that the cooling device includes a hybrid cooler , which cools cooling water of the inverter and the capacitor ; the capacitor is supported upon the vehicle body frame ; the inverter is positioned above the capacitor ; a length of the inverter in the vehicle width direction is shorter than a length of the capacitor in the vehicle width direction; at least one of a first side surface of the outer cover positioned leftwards from a left side surface of the inverter , and a second side surface of the outer cover positioned rightwards from a right side surface of the inverter is separated from the inverter by a gap; and the inverter is installed as separated from the capacitor in the vertical direction by a gap. <EOS>