A work vehicle is constructed such that engine-cooling fresh ambient air is introduced from a driver's deck and then the used air after cooling is discharged forwardly of the vehicle body. The work vehicle includes an engine hood vertically pivotable about a pivot axis provided at a front portion of a vehicle body, the hood including an air outlet opening for discharging the used air after cooling, a control panel forming a rear wall of an engine room, the control panel including an air intake opening for introducing the ambient air and an instrument panel. This instrument panel is formed integrally with an upper and rear end portion of the engine hood, so that the instrument panel may be pivotably opened upwards together with the control panel.