After working for 18 years in the private sector, Kuniko Koda joined the Democratic Party of Japan in 2003 and was elected to the House of Councillors in 2007.
Kouda worked for 18 years at private sector, including an advertising agency and liquor company. In 2003, she joined the Democratic Party of Japan (DPJ). She was elected to the House of Councillors from the Saitama Prefecture for the first time on 29 July 2007. 
