CONSTRUCTION MACHINE

摘要

A suction duct (19) provided in a floor member (9) comprises an internal air duct portion (20) connected to the internal air inlet port (10A3), an external air duct portion (21) connected to an external air inlet port (10E3), and a common duct portion (22) for connecting the internal air duct portion (20) and the external air duct portion (21) to a blower fan 18B suction side of an air conditioner unit (18). The suction duct (19) is constructed to form a hollow column (23) having a hollow closed section structure with the internal air duct portion (20) and the common duct portion (22) formed integrally in the upper and lower directions. Therefore, the hollow column (23) formed of the hollow closed section structure can increase strength of the floor member (9) as a strong column while circulating internal air between the internal air inlet port (10A3) and the air conditioner unit (18).