Hibakusha (被爆者), literally "bomb-affected people," refers to survivors of the United States atomic bombings of Hiroshima (6 August 1945) and Nagasaki (9 August 1945). Under Japan's Atomic Bomb Survivors' Relief Law, the term has a formal legal definition covering several categories: those within the city limits at the time of bombing, those who entered designated zones within two weeks, those exposed to fallout, and children in utero of exposed mothers. Recognized hibakusha receive a techō (health handbook) entitling them to medical benefits.
The number of officially recognized hibakusha has declined from a peak well above 350,000 to under 110,000, with an average age now exceeding 85. Korean residents of Japan, forced laborers, and Allied POWs were also among those exposed; recognition of non-Japanese hibakusha was legally contested for decades, with the Japanese Supreme Court ruling in 2007 that overseas survivors were also eligible for benefits.
In international politics, hibakusha testimony has been a moral cornerstone of the nuclear disarmament movement. Survivors' organizations — most prominently Nihon Hidankyō (the Japan Confederation of A- and H-Bomb Sufferers Organizations), founded in 1956 — have lobbied at the United Nations, NPT Review Conferences, and the negotiations that produced the Treaty on the Prohibition of Nuclear Weapons (TPNW), adopted in 2017 and entering into force in January 2021. The TPNW's preamble explicitly acknowledges "the unacceptable suffering of and harm caused to the victims of the use of nuclear weapons (hibakusha)."
Nihon Hidankyō was awarded the 2024 Nobel Peace Prize for its efforts to achieve a world free of nuclear weapons and for demonstrating through witness testimony that nuclear weapons must never be used again. Hibakusha narratives also shape Japan's own ambiguous nuclear policy, which combines official support for disarmament with reliance on the US extended deterrent.
Example
In December 2024, Nihon Hidankyō co-chair Terumi Tanaka, himself a Nagasaki hibakusha, accepted the Nobel Peace Prize in Oslo and warned against renewed normalization of nuclear threats.
Frequently asked questions
Yes. After prolonged litigation, the Japanese Supreme Court ruled in 2007 that survivors living abroad — including tens of thousands of Koreans exposed during the bombings — are entitled to the same medical benefits as those residing in Japan.
Keep learning