To provide a sound absorption device for improving the problem that violet noise, vibration and the like of an engine, a transmission device and the like are transmitted from inside and outside of a cabin room of a tractor and the like, sufficient noise reduction is hardly performed particularly in ≤500 Hz low frequency band and noise is confined in a corner part of the cabin room and noise reduction can be hardly performed.

In the sound absorption device, a sound absorption apparatus 6 having a sound absorbing cave 5 having a slit-like opening 4 formed in one surface thereof by using a sound absorbing material is provided in a cabin supported and attached to the vehicle body via a vibration preventing body and the opening 4 of the sound absorption apparatus 6 is opposed onto a cabin floor 7.