[PROBLEM] To provide an antioxidant comprising a ginger oil, the antioxidant having a higher unpleasant odor masking effect and a higher inhibitory effect on the increase in peroxide value than those of ginger oils produced by a steam distillation method.[SOLUTION] An antioxidant for an oil or fat or a complex lipid comprises a ginger oil, and the ginger oil has at least one peak detected within 5 minutes before a peak of neral and has at least three peaks within 7 minutes after a peak of geranial when subjected to a high-performance liquid chromatographic analysis in the following analysis conditions:sample: an ethanol containing 0.1% (w/v) of the ginger oil,column: an ODS column having a particle size of 5 µm, an inner diameter of 4.6 mm, and a length of 250 mm),column oven temperature: 40°C,detection wavelength: 228 nm,mobile phase: water (liquid A), acetonitrile (liquid B),flow rate: 1 mL/min, andgradient program:(1) initial condition: 70% liquid A/30% liquid B(2) 0 min to 20 min: linear gradient from the initial condition to 10% liquid A/90% liquid B and(3) 20 min to 40 min: maintaining 10% liquid A/90% liquid B.
