PROBLEM TO BE SOLVED: To provide oil and fat compositions that effectively prevent the oxidation of oils and fats contained therein, for example, when encapsulated, and provide a capsule agent with the improved durability of a capsule containing the oil and fat compositions.SOLUTION: Oil and fat compositions contain oils and fats, and a powder that generates hydrogen by contact with water. A capsule agent is prepared by putting the oil and fat compositions into a capsule having a moisture value of less than 10%. In the capsule agent, the oils and fats are unsaturated fatty acids, and the capsule is a two-piece hard capsule containing a cellulose derivative.SELECTED DRAWING: None【課題】カプセル化した際等に、含有する油脂の酸化を有効に防止することを可能とする油脂組成物及び該油脂組成物を内蔵するカプセルの耐久性能の向上を図ったカプセル剤の提供。【解決手段】油脂と、水との接触で水素を生じる粉末とを含む、油脂組成物であって、該油脂組成物を10%未満の水分値を持つカプセルに封入してなるカプセル剤。油脂が不飽和脂肪酸であり、前記カプセルがセルロース誘導体を含むツーピースハードカプセルであるカプセル剤。【選択図】なし