Provided is a construction machine comprising: a heat exchanger with a core surface in an engine room; a top wall covering an air inlet chamber in the engine room and having a first air inlet; a duct including a main wall guiding air in the air inlet chamber to draw it through the core surface and a front wall facing the core surface and having a second air inlet; a cooling fan sucking external air onto the core surface through the second air inlet; and an air cleaner extending horizontally and orthogonally to an air guiding direction by the main wall. At least a part of the air cleaner exists in a vertical region where the second air inlet is formed. The air cleaner directs, toward the second air inlet, an air flow farthest from the duct, out of the air flow drawn downward through the first air inlet.