To increase the amount of a supplied organic substance derived from food, which is processed by annelids; or to provide an annelid inhabitation bed capable of collecting feces of annelids in the separated state from soil.SOLUTION: An annelid inhabitation bed HB provides a habitat environment to annelids. The annelid inhabitation bed HB comprises a sponge layer 16 having a plurality of sponge pieces, the plurality of sponge pieces having a gap between the sponge pieces.SELECTED DRAWING: Figure 3
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