Senjuro Hayashi was a Japanese general. Born Ishikawa, Japan, February 23, 1876.
Hayashi was a career officer in the Japanese army and one of a group of militarists who came to exercise control over the Japanese government before World War II. As commander of troops in Korea in 1931 he invaded Manchuria, then a part of China, and quickly overran the country. He did so without the permission of the Japanese government. However, despite protests from the League of Nations, the Japanese government acquiesced in Hayashi's action, which was called the Manchurian Incident.
In 1932, Manchuria became the Japanese-controlled state of Manchukuo and Hayashi was promoted to full general. In 1934 he became minister of war and was largely responsible for modernizing and strengthening the Japanese army. Hayashi served on the supreme war council in 1935 and 1936 and was premier for a brief period in 1937. From 1940 to 1943, Hayashi again served on the supreme war council, and he was influential in determining Japan's military and foreign policy during World War II.
Senjuro Hayashi died in Tokyo, Japan, February 4, 1943.