PROBLEM TO BE SOLVED: To provide: a method for improving sweetness of rebaudioside A which is a sweet main component of a stevia extract a sweetener having sweeteness improved by the method and an oral composition such as food and drink.SOLUTION: There are provided a sweetener containing rebaudioside A and mogroside V at the weight ratio of 95:5 to 87:13 (excluding 87:13), and a sweetener further containing thaumatin. An oral or oral cavity composition having sweetness containing rebaudioside A and mogroside V at the weight ratio of 95:5 to 87:13 (excluding 87:13) is also provided.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】ステビア抽出物の甘味主成分であるレバウディオサイドAの甘味質を改善する方法、並びに当該方法によって甘味質が改善された甘味料および飲食品などの経口組成物の提供。【解決手段】レバウディオサイドAとモグロシドVとを、重量比で95:5~87:13(但し、87:13を除く)の割合で含有する、甘味料。さらにソーマチンを含有する前記甘味料。レバウディオサイドAとモグロシドVとを、重量比で95:5~87:13(但し、87:13を除く)の割合で含有する、甘味を有する経口用または口腔用組成物。【選択図】なし