The history of Toshima is a story of rapid transformation from quiet suburbs into one of Tokyo's busiest special wards. Although the ward was only established as an administrative unit in the 20th century, the land on which it sits has a rich past closely tied to the growth of the Japanese capital.
Toshima Special Ward was officially established on March 15, 1947. It was formed through the merger of four towns—Sugamo, Nishi-Sugamo, Takada, and Nagasaki—which were previously part of the Kita-Toshima District. The name "Toshima" itself has more ancient roots, referring to a historical area known since the Nara period (8th century).
The primary factor that transformed the rural outskirts of Edo (the old name for Tokyo) into a densely populated urban center was the development of the railway network during the Meiji era. The construction of the Yamanote Line and the opening of Ikebukuro Station in the early 20th century triggered a boom in population and commercial activity, turning the area into a major transport hub.
Before urbanization, the territory of modern Toshima was predominantly agricultural. It was home to villages that supplied the capital with vegetables and flowers. The region's most significant cultural contribution was the cultivation of the famous "Somei-Yoshino" cherry variety in the former village of Somei (now part of Toshima)—today, it is the most popular variety of ornamental cherry tree in Japan.