To improve the cooling performance of an engine of construction machinery and agricultural machinery such as a hydraulic shovel, a self-loader, a bulldozer, a wheel loader and a crawler-type loader (hereinafter simply referred to as construction machinery), and to improve the maintenance thereof while facilitating the fixing and unfixing of elements of an intake air cleaner.

Coolers 100 such as an inter-cooler IC for a supercharger, a radiator 18 for cooling water, an oil cooler 22 for operating oil to be arranged in an engine 8 loaded on construction machinery are arranged between an operator chamber 10 of the construction machinery and the engine 8. With this structure, an air cleaner element 38 of an air cleaner 32 provided in a front side of the engine 8 can be easily exchanged.