New Conservative Party
In June 2000, she was elected to the Diet of Japan on the Democratic Party ticket as a proportional representative. She left the party in 2002 to join the New Conservative Party. Though she had planned to run for the seat representing the Tokyo 3rd district in 2003, the emergence of Hirotaka Ishihara, son of Governor Shintaro Ishihara, forced her to run from the 4th district, where she was defeated. She then returned to the Diet as a proportional representative of the Liberal Democratic Party in 2004.