To provide a treatment method for soil including a heavy metal capable of suppressing the generation of a corrosive gas when the soil containing the heavy metal such as arsenic is heated and capable of sufficiently suppressing insolubilization of the heavy metal such as arsenic or elution of the heavy metal even if insolubilization is further carried out after the heating treatment.

After an iron compound such as Fe2O3, Fe(OH)3and their compounds, e.g., tri-valent iron compounds containing no sulfuric acid group is added and mixed to the soil including the heavy metal such as arsenic, lead and cadmium, it is heated to a temperature of 200-700°C. The soil becoming the object to be treated may include a volatile contamination substance such as an organic compound in addition to the heavy metal such as arsenic.

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