A free polyunsaturated fatty acid containing at least one free polyunsaturated fatty acid having 20 or more carbon atoms, the content of which is 80.0% or more of the fatty acid in the composition, and the total content of metals is 0.1 ppm or less； Preparing a raw material composition containing a saturated fatty acid-containing composition and at least one polyunsaturated fatty acid having 20 or more carbon atoms, the total content of the prepared raw material composition, lower alcohol and metal being 0.01 ppm or less The reaction solution prepared by combining water and an alkali catalyst is subjected to hydrolysis treatment, and the contact between the reaction composition after hydrolysis treatment and the metal is brought into contact with the composition per 1 g. There is provided a method for producing a composition containing a free polyunsaturated fatty acid, including limiting the product T [cm2 × day] of the surface area [cm2] and the contact time [day] to be 100 or less. .含有量が組成物中の脂肪酸の８０．０％以上である、少なくとも１つの炭素数２０以上の遊離多価不飽和脂肪酸を含み、金属の合計含有量が０．１ｐｐｍ以下である遊離多価不飽和脂肪酸含有組成物と；少なくとも１つの炭素数２０以上の多価不飽和脂肪酸を含む原料組成物を用意すること、用意された原料組成物、低級アルコール、金属の合計含有量が０．０１ｐｐｍ以下の水、及びアルカリ触媒を組み合わせて調製される反応液に対して、加水分解処理を行うこと、加水分解処理後の反応組成物と金属との接触を、１ｇあたりの組成物と金属との接触表面積［ｃｍ２］と接触時間［日］との積Ｔ［ｃｍ２×日］が、１００以下となるように制限すること、を含む、遊離多価不飽和脂肪酸含有組成物の製造方法が提供される。
