栃木選挙区 - 第25回参議院議員選挙 [Tochigi At-Large District - 25th House of Councillors Election]. go2senkyo.com (in Japanese). 2019-07-03. Retrieved 2023-01-23.
"栃木選挙区 - 第26回参議院議員選挙" [Tochigi At-Large District - 26th House of Councillors Election]. go2senkyo.com (in Japanese). 2022-06-22. Retrieved 2023-01-23.
"栃木選挙区 - 第26回参議院議員選挙" [Tochigi At-Large District - 26th House of Councillors Election]. go2senkyo.com (in Japanese). 2022-06-22. Retrieved 2023-01-23.
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栃木選挙区 - 第1回参議院議員補欠選挙 [Tochigi At-Large District - 1st House of Councillors By-Election]. go2senkyo.com (in Japanese). Retrieved 2023-01-24.
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"総務省|令和4年9月1日現在選挙人名簿及び在外選挙人名簿登録者数" [Ministry of Internal Affairs and Communications - Number of registered voters as of 1 September 2022] (in Japanese). Retrieved 2023-01-04.