|April 8,1938||Foundation of Sonoda Girls’ High School.|
|April 8,1947||Foundation of Sonoda Gakuen Junior High School under the New School System Law.|
|April 8,1948||Foundation of Sonoda Gakuen High School.|
|April 1,1963||Foundation of Sonoda Gakuen Women’s Junior College.|
|April 1,1966||Foundation of Sonoda Gakuen Women’s University.|
|October 26,1988||Celebrations for the fiftieth anniversary of the foundation of Sonoda Gakuen.|
|August 21,1997||Completion of the new multipurpose Seimei-Hall, a new building for club rooms and swimming pool.|
|October 28,1998||Celebrations for the sixtieth anniversary of the foundation of Sonoda Gakuen.|
|April 1,2001||Alteration 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 1,2006||Restructuring of the senior high school courses into an Advanced Studies program and a General Studies program.|
|April 1,2013||Restructuring of the senior high school courses into an Advanced Studies program, a Comprehensive Studies program, and a General Studies program.|