The composter provided by the invention is intended primarily for composting household waste, i.e. organic waste such as food waste and the like. To this end the composter comprises a rotatable drum with an inlet at an upstream end thereof and an outlet at a downstream end thereof, whereby, when the composter is in use, household waste placed in the composter at the inlet is caused to progress in stages from the upstream end thereof towards the downstream end thereof whereat the composted household waste may be removed at the outlet. The rotatable drum is of plygonal cross section, i.e. the drum is ten sided in order to facilitate periodic rotation of the drum between successive ones of its ten sides over a period of time. The inlet is mounted on the upstream end of the drum for orientation into an upright position after each rotational movement of the drum. Internally, the drum is provided with a series of deflector means for ensuring that the waste material is directed downstream away from the inlet and towards the outlet as the drum is rotated. The composter, which is moulded from plastic material, is provided with a receptacle for the recovery of leachate. Alternative uses of the composter includes the propagation of earth worms for fishermen.