PROBLEM TO BE SOLVED: To provide a method in which degradation of edible oil can be suppressed than before.SOLUTION: Provided is a method in which the degradation of edible oil is suppressed by contacting edible oil in use or after use to a clarifying agent for edible oil incorporated with tartrate.SELECTED DRAWING: Figure 1【課題】食用油の劣化を、これまでよりも抑える。【解決手段】酒石酸塩を配合した食用油用浄化剤に、使用中または使用済の食用油を接触させることで食用油の劣化を抑える。【選択図】図1