PROBLEM TO BE SOLVED: To provide an oral preparation based on a liver function-ameliorating material aggressively reducing GOT and GPT in the blood, and useful for treatment and prevention of various kinds of diseases.SOLUTION: The oil and fat composition or the food for ameliorating the liver function, containing the agent for ameliorating the liver function, containing 4-15 wt.% S2U-type triglyceride as an active ingredient in the oil and fat is obtained. In the formula, S is a 20-24C saturated fatty acid residue, and U is a &ge16C unsaturated fatty acid residue. The S is preferably a behenic acid residue, and U is preferably an oleic acid residue.COPYRIGHT: (C)2009,JPO&INPIT【課題】血液中のGOT,GPTを積極的に低下させることができる、肝機能改善物質に基づく各種疾患の治療,予防に役立つ経口物を得る。【解決手段】S2U型のトリグリセリドを有効成分とした肝機能改善剤を、油脂中に4~15重量%含んだ油脂組成物または肝機能改善用食品を得た。Sがベヘン酸残基、Uがオレイン酸残基であることが好ましい。但し式中、Sは炭素数20から24の飽和脂肪酸残基、Uは炭素数16以上の不飽和脂肪酸残基である。【選択図】なし