To provide an odor-reducing agent for olefin-based resin that can effectively reduce food-derived odor adhering to and permeating into olefin-based resin, and to provide a method for reducing food-derived odor from olefin-based resin.SOLUTION: Provided is an odor-reducing agent for olefin-based resin, containing one kind or more selected from the compounds that are (a) a monoester or diester of a monocarboxylic acid and a monohydric or dihydric alcohol, and having a total carbon number of 8 or more and 30 or less.SELECTED DRAWING: None【課題】オレフィン系樹脂に付着浸透した食品由来の臭気を効果的に低減できるオレフィン系樹脂の臭気低減化剤、及びオレフィン系樹脂から食品由来の臭気を低減させる方法の提供。【解決手段】（ａ）モノカルボン酸と一価又は二価のアルコールとのモノエステル又はジエステルであって、総炭素数が８以上３０以下である化合物から選ばれる１種以上を含有する、オレフィン系樹脂の臭気低減化剤。【選択図】なし
