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PROBLEM TO BE SOLVED : To provide a soil solidification agent which can make a sludge, a surplus soil at a construction site or the like into a solidified product so as to prevent them from re-sludging or into a solidified product that has a good aggregate structure to promote the growth of plant, has greater strength and in addition prevents toxic heavy metals from eluting, and to provide a method for solidifying soil and such a solidified product. SOLUTION : The soil solidification agent incorporates : a solidification main agent formed by adding slaked lime or cement as an alkali stimulant into granulated blast furnace slag and gypsum dihydrate; and a solidification aid consisting of five or more selected from potassium chloride, magnesium chloride, sodium chloride, calcium chloride, ammonium chloride, potassium carbonate, sodium sulfate, sodium phosphate, barium oxide, and manganese dioxide; and one or more selected from citric acid, tartaric acid and maleic acid. This soil solidification agent and one or more substances selected from soil such as earth, charcoal such as brown coal, incineration ashes, porous bodies such as a shellfish fossil, lightweight minerals such as perlite, and acrylic, underwater-inseparable admixtures are mixed and solidified to obtain the solidified product. COPYRIGHT : (C)2006, JPO&NCIPI