To make cleaning workability easy as well as improving cooling capacity while making its installation space compact in arrangement of a plurality of heat exchangers.

A cooling system of a construction machine comprises mounting portions 26, 26 of tubes installed fixedly on either side of an intercooler 22, and the tubes 27, 27 that are distributed on either side of the intercooler 22 and further are arranged toward a backside of the intercooler 22 nearly horizontally. Support brackets 28, 28 are installed in a laterally protruding manner on either side of an oil cooler 21. The tubes 27, 27 are inserted into insides of the support brackets 28, 28 to be supported in a back and forth slidable manner. Thereby, the intercooler 22 can be supported in a back and forth movable manner in the support brackets 28, 28 of the oil cooler 21.

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