was an Imperial Japanese Army facility called the Kwantung Army Warhorse Disease Prevention Shop that focused on the development of biological weapons during World War II. It was operated by the Kempeitai, the Japanese military police. Its headquarters was located in Mokotan, Manchukuo, a village just south of the city of Changchun. The Unit was led by Wakamatsu Yujiro.
Land for the construction of Unit 100's facilities was seized by local officials and sold to the Japanese. The area encompassed approximately 20 square kilometers, much of which was occupied by an experimental farm. Conscripted Chinese laborers were used to build a large network of buildings in a short period of time. Unit 100 started operations in 1936 after the first buildings at the facility were completed.
- Lieutenant General Takahashi, Chief of the Veterinary Administration of the Kwantung Army
- Sakurashita Kiyoshi, civilian employee