This invention provides an acidic liquid seasoning containing flax, capable of sufficiently maintaining the unique aroma of flax even after being stored for a long time. The liquid seasoning of this invention comprises flax, acetic acid, and at least one selected from the group consisting of butyric acid, hexanoic acid, and 6-methyl-5-hepten-2-one.本發明係提供即使長期保管後,仍可充份保持胡麻特有的芳香之含有胡麻的酸性液體調味料。本發明之液體調味料係含有胡麻、醋酸、與至少1種選自丁酸、己酸、及6-甲基-5-庚烯-2-酮所成群而成者。