This article explores why Japan is not allowed to have nuclear weapons. It discusses the country's anti-nuclear stance since the atomic bombings of Hiroshima and Nagasaki, its post-WWII constitution which forbids using force or acquiring any type of military weapon for offensive purposes, and its participation in the Nuclear Non-Proliferation Treaty (NPT). It also mentions Japan's reliance on US support for security due to lack of military power, international pressure and sanctions against nuclear proliferation in Japan, and opposition within society towards possession of these types of arms due to their devastating effects on human life. Ultimately, it appears highly unlikely that Japan will acquire nuclear weapons anytime soon.