Tsugaru studied and graduated from the Gakushuin Women's Junior College in 1961. She met and married HIHPrince Hitachi, the second son of HIM the Shōwa Emperor, on 30 September 1964. Prince and Princess Hitachi have no children.
Princess Hitachi is president of various organizations that concern themselves with welfare and the arts. She has also translated various children books from English into Japanese.