Abstract: A compactor is provided wherein cuttings delivered to a compaction chamber 33 by a screw conveyor 22 are compacted into a solid product W by operating a hydraulic cylinder 28, and subsequently a gate member 51 disposed at one end of the compaction chamber 33 is opened so as to discharge the solid product W via the one end of the compaction chamber 33. The compaction chamber 33 includes a first cylindrical body 31 and a second cylindrical body 40. The second cylindrical body 40 is removably mounted to one end of the first cylindrical body 31 for facilitating the replacement of the second cylindrical body 40 when the second cylindrical body 40 is worn.