PROBLEM TO BE SOLVED: To reduce, by lowering the temperature of an outer peripheral surface of an exhaust pipe, the failure of neighboring equipment caused by heat and lower the temperature of exhaust gas to lessen deterioration in the environment of workers.SOLUTION: A work vehicle is equipped with an upward exhaust tube (61) for guiding exhaust gas of an engine (9) to the outside of the vehicle. The exhaust tube (61) is formed of an inner exhaust pipe (61A) and an enclosure tube (61B) enclosing the outer periphery of the exhaust pipe (61A). Between the outer peripheral surface of the exhaust pipe (61A) and the inner peripheral surface of the enclosure tube (61B), a fluid chamber (100) is formed, in which a fluid such as air, water and oil can be stored. A circulation device (106) is provided for circulating the fluid between the fluid chamber (100) and a cooler (105) equipped outside the fluid chamber (100). Further, a control device (115) is provided for automatically operating the circulation device (106) when the temperature of exhaust gas exceeds a first set temperature.【課題】排気管の外周面の温度を低下させ、熱による周辺の機器の故障を少なくすると共に、排気ガスの温度を低下させて作業者の環境の悪化を少なくする。【解決手段】エンジン（９）の排気ガスを車外へ案内する上向きの排気筒（６１）を備え、排気筒（６１）を内側の排気管（６１Ａ）と排気管（６１Ａ）の外周を包囲する包囲筒（６１Ｂ）から構成し、排気管（６１Ａ）の外周面と包囲筒（６１Ｂ）の内周面との間に、空気や水やオイルなどの流体を溜めうる流体室（１００）を形成し、流体を流体室（１００）と該流体室（１００）の外部に備えた冷却器（１０５）との間で循環させる循環装置（１０６）を設ける。また、排気ガスの温度が第１設定温度を超えた場合に、循環装置（１０６）を自動的に作動させる制御装置（１１５）を設ける。【選択図】 図５
