Oxidation stability is improved and a long chain polyunsaturated fatty acid-containing fat with a good flavor is obtained with a method for manufacturing a long chain polyunsaturated fatty acid-containing fat with a moisture content of 3 weight% or less, the method comprising a step for treatment by contact with rosemary. Consequently, it is possible to limit the generation of reversion flavor, unpleasant odors, and peroxides that have health-harming effects over long periods and to provide a highly healthy long chain polyunsaturated fatty acid-containing fat at less cost than in the past. By adding a relatively small amount of an antioxidant substance, oxidation stability can be further improved.
