An engine air intake device for use in a construction machine for supplying air to an engine, the air intake device comprising: a plurality of air cleaners (20A, 20B) each including an air inlet for drawing in air, a cleaner main body for filtering the drawn-in air through the air inlet, and an air outlet for drawing out the air filtered through the cleaner main body; a merging chamber connected to the air outlets of the air cleaners (20A, 20B), and for merging the airs drawn out through the air outlets of the air cleaners (20A, 20B) to supply the merged air to the engine, wherein the merging chamber is disposed along a direction orthogonal to axial directions of the air cleaners (20A, 20B), characterized in that the air intake device further comprises an air intake duct having a duct main body connected to the air inlets of the air cleaners (20A, 20B) and for drawing in external air, wherein the air cleaners (20A, 20B) are disposed on a horizontal plane in a state that the air inlets of the air cleaners (20A, 20B) are directed in a same direction being an upward direction or a downward direction, and that the axial directions of the air cleaners (20A, 20B) are aligned in parallel to each other, and parallel to the horizontal plane the air intake duct is disposed to overlap the air cleaners (20A, 20B) in the upward direction or the downward direction, in which the air inlets of the air cleaners (20A, 20B) are directed, wherein the air intake duct is disposed with respect to the air cleaners (20A, 20B) in such a manner that the lengthwise direction of the duct main body is aligned in parallel to the axial directions of the air cleaners (20A, 20B). a plurality of air cleaners (20A, 20B) each including an air inlet for drawing in air, a cleaner main body for filtering the drawn-in air through the air inlet, and an air outlet for drawing out the air filtered through the cleaner main body; a merging chamber connected to the air outlets of the air cleaners (20A, 20B), and for merging the airs drawn out through the air outlets of the air cleaners (20A, 20B) to supply the merged air to the engine, wherein the merging chamber is disposed along a direction orthogonal to axial directions of the air cleaners (20A, 20B), characterized in that the air intake device further comprises an air intake duct having a duct main body connected to the air inlets of the air cleaners (20A, 20B) and for drawing in external air, wherein the air cleaners (20A, 20B) are disposed on a horizontal plane in a state that the air inlets of the air cleaners (20A, 20B) are directed in a same direction being an upward direction or a downward direction, and that the axial directions of the air cleaners (20A, 20B) are aligned in parallel to each other, and parallel to the horizontal plane the air intake duct is disposed to overlap the air cleaners (20A, 20B) in the upward direction or the downward direction, in which the air inlets of the air cleaners (20A, 20B) are directed, wherein the air intake duct is disposed with respect to the air cleaners (20A, 20B) in such a manner that the lengthwise direction of the duct main body is aligned in parallel to the axial directions of the air cleaners (20A, 20B).