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- April 8,1938Foundation of Sonoda Girls' High School.
- April 8,1947Foundation of Sonoda Gakuen Junior High School under the New School System Law.
- April 8,1948Foundation of Sonoda Gakuen High School.
- April 1,1963Foundation of Sonoda Gakuen Women's Junior College.
- April 1,1966Foundation of Sonoda Gakuen Women's University.
- October 26,1988Celebrations for the fiftieth anniversary of the foundation of Sonoda Gakuen.
- August 21,1997Completion of the new multipurpose Seimei-Hall, a new building for club rooms and swimming pool.
- October 28,1998Celebrations for the sixtieth anniversary of the foundation of Sonoda Gakuen.
- April 1,2001Alteration of the curriculum for the junior high school into the six year secondary school system.
Establishment of the new Inter-cultural program and Computer program at the senior high school.
- April 1,2006Restructuring of the senior high school courses into an Advanced Studies program and a General Studies program.
