Inorganic anions, such as bromide, nitrate, phosphate, and sulfate in wakame (Undaria pinnatifida), were determined using ion chromatography (IC). Dried wakame samples were prepared by drying and powdering boiled and salted wakame, whose production districts were clear. The above inorganic anions in the samples were extracted into pure water using ultrasonic extraction prior to IC analysis. Linear discriminant functions were obtained using the PO₄³⁻-P and SO₄²⁻-S results. The misclassification rates of identification were 5.56 and 6.67% for the boiled and salted wakame produced in the Sanriku area and those in China, respectively ; the misclassification rates were 0 and 0% for the wakame produced in the Naruto area and those in China, respectively. Inorganic anions in dried wakame available in the market were similarly determined. The discriminant functions were applied to the analytical results after the SO₄²⁻-S results were corrected using the average concentration ratio for SO₄²⁻-S between the boild and salted wakame and dried wakame purchased in the market. The misclassification rates of identification were 25.0 and 35.7% for the purchased wakame produced in the Sanriku area and those in China, respectively ; the misclassification rates were 12.5 and 35.7% for the purchased wakame produced in the Naruto area and those in China, respectively. The proposed procedure could be useful as a simple screening method to identify wakame production districts.