Shirō Ishii

Graduation photo of Shiro Ishii from the Department of Medicine of Kyoto Imperial University in 1920

Ishii in 1939 inspecting water filters at the Battle of Khalkhin Gol

Shiro Ishii middle aged

Shiro Ishii at a reunion party of Unit 731 members after the war

Shiro Ishii after the war

Shirō Ishii (石井 四郎, Ishii Shirō, June 25, 1892 – October 9, 1959) was a Japanese microbiologist and a lieutenant general in the Imperial Japanese Army. Ishii led the infamous Unit 731, a covert biological and chemical warfare research and development unit of the Japanese military that undertook lethal human experimentation during the Second Sino-Japanese War (1937–1945) and World War II. His work and the activities of Unit 731 present some of the most egregious examples of war crimes related to medical science in history.

Early Life and Education

Shirō Ishii was born in Shibayama, Chiba Prefecture, Japan. He graduated from the medical school of Kyoto Imperial University in 1920, where he focused on microbiology and the emerging field of immunology. Ishii's interest in biological warfare was sparked by the use of chemical weapons during World War I, and he became an advocate for the development of biological warfare within the Japanese military.

Military Career and Unit 731

In 1932, Ishii began his biological warfare research, and by 1936, he was instrumental in the establishment of Unit 731 in the Pingfang district of Harbin, the largest city in the Japanese puppet state of Manchukuo (now Northeast China). Under Ishii's direction, Unit 731 conducted experiments on thousands of human subjects, including Chinese civilians and military personnel, Korean nationals, Soviet prisoners of war, and even Allied prisoners. The experiments included vivisections, forced pregnancies, and simulations of strokes, heart attacks, frostbite, and hypothermia, among others, to study their effects on the human body.

War Crimes

The activities of Ishii and his unit remained one of the most closely guarded secrets of Imperial Japan during the war. After Japan's surrender in 1945, Ishii and other members of Unit 731 were arrested by U.S. forces. However, in a controversial decision, Ishii and his team were granted immunity from war crimes prosecution in exchange for their full cooperation with the U.S. in sharing the results of their research. This decision has been criticized for prioritizing scientific gain over justice for the victims of Unit 731's experiments.

Later Life

After the war, Ishii lived in relative obscurity and never faced trial for his actions during the war. He died of throat cancer in 1959.

Legacy

The legacy of Shirō Ishii and Unit 731 remains a contentious issue in Japan and its neighboring countries, particularly China and Korea, where memories of the atrocities committed by Unit 731 still evoke strong emotions. Efforts to bring full recognition and accountability for the actions of Ishii and his unit continue, including demands for apologies and reparations to the victims and their families.