Graduated from Japanese History Course of Literature Department of Tokyo University in 1924.
Masao Toba served with Agriculture & Forestry Ministry and then became professor of of Jingu Kogakukan College in 1933.
He served then as shokittaku (professional associate) of Agriculture & Forestry Ministry and War Ministry, koshokan (officer in charge of methodology of historical researches) of Home Ministry, chief of Koshoka (Historical Research Section) of Jingun (Shrine Board) (from 1953) and member of several other governmental and academic institutes.
Became professor of Science & Literature Department and Department of Education of Kagoshima University (since 1951). Held additional post of director of Shakai Keizaishi Gakukai (Society of the History of Social Economics). His books include Nipponno Shiro (The Castles in Japan) and Nippon-no Jokaku-shi (The History of Japanese Castles).