PROBLEM TO BE SOLVED: To provide a drink in which flavor is satisfactory, and also, deterioration in quality in long term preservation is suppressed though being a functional drink capable of supplying a user with moisture and mineral contents lost by perspiration or the like.SOLUTION: Provided is a container-packaged soft drink in which sarcocarp is 4.0 to 10.0 and the content of sodium is 20 to 100 mg/100 g. Also provided is a method for producing a container-packaged soft drink including a step of regulating its sarcocarp to 4.0 to 10.0 and a step of regulating a sodium content to 20 to 100 mg/100 g. Also provided is a method for suppressing deterioration in quality upon preservation of a container-packaged soft drink.COPYRIGHT: (C)2015,JPO&INPIT【課題】発汗等により失われる水分やミネラル成分を補給可能な機能的飲料でありながら、風味が良好であり、かつ長期保存における品質の低下が抑制された飲料を提供する。【解決手段】糖度が4.0~10.0であり、ナトリウム量が20mg/100g~100mg/100gであることを特徴とする容器詰清涼飲料、糖度を4.0~10.0に調整する工程と、ナトリウム含有量を20mg/100g~100mg/100gに調整する工程とを含むことを特徴とする容器詰清涼飲料の製造方法及び容器詰清涼飲料の保存時品質低下抑制方法を提供する。【選択図】なし