To provide a decontaminating material which does not clog a gap among soil particles when mixed with the soil, can decontaminate soil speedily while keeping a smooth flow of water in the soil and can surely remove heavy metals in the soil and to provide a decontamination facility.

The decontaminating material is obtained by mixing a powdery material, which can adsorb heavy metals such as arsenic, selenium, hexavalent chromium, lead, cadmium, and fluorine and boron when brought into contact with water, with a fibrous base stock having <1,000 μm average diameter to obtain a mixture and mixing the mixture in the soil. The fibrous base stock is preferably an inorganic fiber which includes 30-40 wt% CaO and 35-45 wt% SiO2and has 1-10 μm average diameter.

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