To provide a casing for an excavation device suitable for attenuating noise.

This casing (7) is attachable to the feed beam (4) of the excavation device. The casing (7) and at least a part of the feed beam (4) define together a noise attenuating housing structure for storing the excavator (5) of the excavation device, and enable the relative motion between the feed beam (4) and the feed beam holder (3) of the excavation device. The housing structure is disposed to seal the noise generating portion of the excavation device. The wall of the casing (7) comprises one or more panels each of which is covered with a sound absorbing material on at least one side.