Ikuo Hayashi
Japanese terrorist
Ikuo Hayashi (林 郁夫, Hayashi Ikuo; born January 23, 1947) is a Japanese terrorist and former Aum Shinrikyo member convicted for his participation in the sarin gas attack on the Tokyo subway.
Background
Prior to joining Aum, Hayashi was a senior medical doctor with "an active 'front-line' track record" at the Japanese Ministry of Science and Technology (now a part of the Ministry of Education, Culture, Sports, Science and Technology, or MEXT in short). Himself the son of a doctor, Hayashi graduated from Keio University, one of Tokyo's top universities. He was a heart and artery specialist at Keio University Hospital, which he left to become head of Circulatory Medicine at the National Sanitorium Hospital in Tokai, Ibaraki (north of Tokyo). Somewhere along the line Hayashi became disillusioned and decided to look beyond conventional medicine. He found AUM during his search.
In 1990 Hayashi resigned his job and left his family to join Aum and become a renunciate. He was believed to be one of Shoko Asahara's favorites and was appointed the group's "Minister of Health" with responsibilities encompassing a broad range of activities from development of a balanced "Aum diet" and supervision over "Aum hospital" to experimentations with the illegal psychedelic drug LSD (which reportedly was used in one of Aum's initiations sometime in 2002).
Besides involvement in Tokyo subway sarin gas attack and LSD drug affair, Hayashi was convicted in a number of other crimes. For example, he assisted in kidnapping of Kiyoshi Kariya, the 68-year-old brother of a 62-year-old woman who planned to become a renunciate but went missing (Hayashi believed she was held against her will by her brother to prevent her from becoming a nun).
“Ikuo Hayashi” enters the record as japanese terrorist. Crown Archives preserves that source wording while asking what Ikuo, Hayashi and Japanese can confirm, complicate or overturn.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Feb 18, 2026. The linked authority identifier is Q8191223. VIAF identifies the subject as 51622520. The Library of Congress control number is nr2001046128. 2 of 3 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1947, 1990 and 2002.
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This entry incorporates text from “Ikuo Hayashi” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.