To reduce ventilation noise generated from air passing through a vent pipe of a ventilation work machine.SOLUTION: A ventilation work machine 10 includes a ventilation part 20 for sending air, and a vent pipe 30 coupled to an air duct 21a of the ventilation part 20. The vent pipe 30 includes an elbow pipe 31 on a base end side thereof which is coupled to an air duct 20a, and a straight pipe 33 extending straight from the elbow pipe 31 toward a front end side of the vent pipe. A noise reduction pipe part 41 whose inner peripheral surface is provided with a sound absorber 42 is disposed at a base end part of the straight pipe 33 located closer to a front end side than the elbow pipe 31 of the vent pipe 30.SELECTED DRAWING: Figure 1
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