Tashiro became Vice Chief of the 5th Section (Asian Intelligence), 2nd Bureau within the General Staff in 1926, and was considered an expert on China. He was promoted to major general in 1930, when he was given command of the IJA 27th Infantry Brigade. In 1932, he was promoted to Chief of Staff of the Shanghai Expeditionary Army.
Tashiro took on the role of Vice Chief of the 5th Section (Asian Intelligence), 2nd Bureau within the General Staff in 1926 and became known as an expert on China. He was promoted to major general in 1930, where he commanded the IJA 27th Infantry Brigade. In 1932, he was elevated to Chief of Staff of the Shanghai Expeditionary Army.