Construction machine

A construction machine includes an exhaust duct (50) for discharging a lower airflow to the exterior of an engine room (37). An air inlet (51) for introducing air into the exhaust duct is provided in an upper portion of the exhaust duct, and an air outlet (52) for discharging the air from the exhaust duct is provided in a lower portion of the exhaust duct. An air passage is formed in the interior of the exhaust duct between the air inlet and the air outlet. The exhaust duct is disposed on an exhaust side of the engine room such that the air introduced into the air passage in the exhaust duct through the air inlet is discharged below the engine room from the air outlet through a discharge port, and such that a hydraulic pump (44) provided on the exhaust side of the engine room is shielded from the discharge port by the exhaust duct.