To provide a working machine which allows clogging of a dust-proofing net to be easily confirmed and allows the dust-proofing net to be cleaned at high cleaning work efficiency.

An air suction port 19 sucking cooling air into a machine-containing chamber 16 of a building cover 15 and the dust-proofing net 21 covering the suction port 19 are provided beneath a building support frame 9 constituting a body frame 7. This configuration allows a worker on the ground to easily confirm a clogging state of the dust-proofing net 21 even if the building cover 15 is provided at a high place from the ground, and allows the dust-proofing net 21 to be timely cleaned. Since the dust-proofing net 21 can be easily removed from the ground, cleaning work efficiency of the dust-proofing net 21 and safety can be enhanced.