Dim content As New Dictionary(Of String, Object) content.Add("list", New Dictionary(Of String, Object) From { {"grouplist", {"fruit", "animal", "flower"}}, {"fruit", {"リンゴ", "バナナ", "イチゴ"}}, {"animal", {"イヌ", "ネコ", "ウサギ"}}, {"flower", {"バラ", "ユリ", "キク"}} }) content.Add("list2", New Dictionary(Of String, Object) From { {"grouplist", {"fruit", "animal", "flower"}}, {"fruit", {"リンゴ", "バナナ", "イチゴ"}}, {"animal", {"イヌ", "ネコ", "ウサギ"}}, {"flower", {"バラ", "ユリ", "キク"}} }) Dim jsonText As String = JsonConvert.SerializeObject(content, Formatting.Indented) Debug.WriteLine(jsonText)