御茶水女子大學
Yuasa was born in Taitō Ward, Tokyo, in 1909. Her father was an engineer who worked for the Japanese patent office and her mother was from a traditional literary family; Toshiko was the second-youngest of seven children. She attended the Division of Science at Tokyo Women's Higher Normal School (now Ochanomizu University) from 1927 until her graduation in 1931. She then enrolled in the Department of Physics at Tokyo Bunrika University (now the University of Tsukuba), making her the first woman in Japan to study physics. She graduated in 1934.