Masako Sen (千 容子, Sen Masako, born 23 October 1951), formerly Princess Masako of Mikasa (容子内親王, Masako Naishinnō), is a former member of the Imperial Family of Japan. She is the fourth child and second daughter of Takahito, Prince Mikasa and Yuriko, Princess Mikasa.[1] She is the wife of the 16th-generation Soshitsu Sen.

Masako Sen
Princess Masako of Mikasa (容子内親王)

(1951-10-23) 23 October 1951 (age 71)
Kamiōsaki, Shinagawa, Tokyo, Japan
(m. 1983)
  • Akifumi Kikuchi
  • Makiko Sakata
  • Takafumi Sen
RelativesImperial House of Japan


For her early education as a child, Princess Masako attended Gakushuin Elementary School and then Gakushuin Women's Secondary School. She later enrolled in the Department of Japanese Language and Literature, Faculty of Letters, Gakushuin University. After completing three years, she was sent to a boarding school in Switzerland and moved to Paris for studying in the University of Sorbonne.

Marriage and familyEdit

Princess Masako married Masayuki Sen (b. 1956), the elder son of Sōshitsu Sen XV, on 14 October 1983.[2] Upon her marriage, she gave up her imperial title and left the Japanese Imperial Family as required by Imperial Law,[3] and took the surname of her husband. He succeeded his father and thus became Sōshitsu Sen XVI [ja], the sixteenth hereditary grand master (Iemoto) of the Urasenke Japanese Tea Ceremony School, in December 2002.[4]

The couple have two sons and one daughter:

  • Akifumi Kikuchi (born 10 November 1984), had his surname officially changed from "Sen" to "Kikuchi" in 2014[5]
  • Makiko Sakata (born 11 July 1987), married in 2017 to Munehiro Sakata[6]
  • Takafumi Sen (born 6 July 1990)

Official activitiesEdit

Masako Sen has been active in the Soroptimist International (SI) organization in Japan. She was President of the SI Kyoto Club in 2006, and again, in 2016. In 2012, she was elected as the 14th Governor of Japan's Soroptimist International of the Americas (SIA) Chuo Region.[7] In March, 2018, she was elected as Chair of the Soroptimist Japan Foundation.[8]

Titles and stylesEdit

Styles of
Princess Masako of Mikasa
(before her marriage)
Reference styleHer Imperial Highness
Spoken styleYour Imperial Highness
  • 23 October 1951 – 14 October 1983: Her Imperial Highness Princess Masako
  • 14 October 1983 – present: Mrs. Soshitsu Sen


National honoursEdit



  1. ^ Kunaicho | Their Imperial Highnesses Prince and Princess Mikasa and their family
  2. ^ "Princess Masako of Mikasa and Masayuki Sen pose for photographs with".
  3. ^ The Imperial House Law, Article 12,,
  4. ^ "The Urasenke Konnichian Web Site".
  5. ^ "【ご報告】苗字がかわりました : Chori official blog-地図をつくる-". Archived from the original on 2015-02-05. Retrieved 2015-02-05.
  6. ^ "千 万紀子様、結納の儀".
  7. ^ "クラブの歩み | 国際ソロプチミスト京都 Soroptimist International of Kyoto".
  8. ^ "財団の歴史 - ソロプチミスト日本財団について | 公益財団法人 ソロプチミスト日本財団".