Provided is a construction machine capable of accepting additional equipment, including: an upper slewing body including an upper frame (25); an engine room (12) provided on the rear portion of the upper frame (25); a cabin (17) provided on the front portion on the right or left side of the upper frame (25); a plurality of tanks including a fuel tank (18) and a hydraulic tank (19) placed on the upper frame (25); an air cleaner (37); a center foothold (20) provided on the widthwise intermediate portion of the upper frame (25) and forward of the engine room (12); and a climbing step (21) provided in the opposite side to the cabin (17). A first tank of the plurality of tanks is placed on a portion on the right or left side of the upper frame (25), and a second tank is arranged on a portion between the cabin (17) and the engine room (12) on the opposite side to the first tank. The air cleaner (37) is superposed on the second tank.
