This work vehicle is provided with an engine 5 that is mounted in the front portion of a traveling machine, an aftertreatment device 52 that purifies exhaust gas from the engine, and a cooling fan 59 for air-cooling the engine 5. The cooling fan 59 is disposed on the front surface side of the engine 5, and the cooling fan 59, engine 5, and aftertreatment device 52 are covered by a bonnet 6. The bonnet 6 is provided with a shield plate 205 that covers one side of the engine 5 below the aftertreatment device 52, said shield plate 205 being configured to be a porous plate that is provided with a plurality of holes.