A deoxidizing agent for edible oils, comprising carbonate group-containing magnesium hydroxide particles represented by the following formula (1) and having a BET specific surface area of 80 to 400 m2/g or baked particles thereof, and a method of regenerating an used edible oil by using the deoxidizing agent. Mg(OH)2-x(CO3)0.5x.mH2O (1) (x satisfies 0.02≦x≦0.7 and m satisfies 0≦m≦1.)The above deoxidizing agent has excellent deoxidizing capability.
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