She is currently a member of the House of Councillors from the Liberal Democratic Party and the President of the Japan Skating Association. Hashimoto served as state secretary (senior vice-minister) for foreign affairs under the Taro Aso administration (2008-2009).
Her father gave her the name Seiko, after the Olympic Flame (seika 聖火) when she was born in 1964, the year of the Tokyo Olympics.