To obtain a low-cost adsorbent for removing arsenic excellent in selective arsenic ion adsorptivity, having high adsorption capacity and small pH dependency, capable of adsorbing and removing arsenic (V) ions in water with a small amount of addition over a wide pH range, exhibiting particularly effective adsorption characteristics in a pH range near neutrality, giving treated water capable of reutilization or direct release and capable of also directly removing arsenic (III) ions in water to below an effluent standard or a standard of water-purity for tap water with respect to arsenic (III) ions without carrying out oxidation treatment.

The adsorbent for removing arsenic comprises at least one soil selected from pseudo greyed yellowish brown forest soil (Tazawako-machi, Akita Prefecture), yellowish brown forest soil (1) (Takuba-shi, Ibaragi Prefecture), gley soil acidic with sulfuric acid (Miura-mura, Ibaragi Prefecture), Kanumado (Kanuma-shi, Tochigi Prefecture), ando soil (1) (Miura-mura, Ibaragi Prefecture) and ando soil (2) (Tukuba-shi, Ibaragi Prefecture).