Construction Machine

A hydraulic excavator () includes a vehicle body composed of a self-propelled lower traveling structure () and an upper revolving structure (), and an operator's seat () provided on the upper revolving structure (). The upper revolving structure () is provided with a fuel cell () generating power supplied to an electric motor (), a hydrogen tank () storing hydrogen supplied to the fuel cell (), a heat exchanger () cooling the fuel cell (), and cooling fans (C), (D), (A), (A) each supplying a cooling air to the heat exchanger (). The operator's seat () is disposed on the upstream side of the hydrogen tank () with respect to a flow direction of a cooling air F generated by the cooling fans (C), (D), (A), (A).