PROBLEM TO BE SOLVED: To remove nitric oxide in exhaust gas discharged from a DPF unit with a urea selective catalytic reduction device.SOLUTION: A urea selective catalytic reduction device 70 removing nitric oxide in exhaust gas after passage of a DPF unit 40 capturing and removing fine particles in the exhaust gas of an engine 9 is arranged on an upper side of the DPF unit 40. A cover 45 covering one right/left side of the urea selective catalytic reduction device 70 and DPF unit 40 and opening the other right/left side is arranged. An exhaust gas inflow port of the DPF unit 40 is connected to an exhaust manifold 30B of the engine 9 through a connection pipe 50. An exhaust outflow port of the DPF unit 40 is connected to an exhaust gas inflow port of the urea selective catalytic reduction device 70 through a connection pipe 73. A tail pipe 61 is connected to an exhaust gas outflow port of the urea selective catalytic reduction device 70.SELECTED DRAWING: Figure 9
