1945 August 6 The world's first atomic bomb detonates at approximately 600 meters over downtown Hiroshima; the city is destroyed.
1949 August 6 The Hiroshima Peace Memorial City Construction Law is promulgated after receiving over 90 percent support in Japan's first public referendum.
September The A-bomb Reference Material Display Room (A-bomb Memorial Hall) is established in the Hiroshima Central Public Hall. This is the first public display of atomic bomb materials.
1952 March It is decided that, under the Hiroshima Peace Memorial City Construction Law, the Peace Memorial Hall, Peace Memorial Museum, City Auditorium, and the Cenotaph for the A-bomb Victims will be constructed in Peace Memorial Park as reminders of the past and contributions to a future of lasting peace.
1955 The Peace Memorial Hall and the Peace Memorial Museum open.
The volunteer citizen group A-bomb Materials Collection Support Association (now, A-bomb Materials Preservation Association) leads an effort that involves many Hiroshima residents in the gathering of materials related to the atomic bombing.
1958 The Hiroshima Restoration Exposition is held in and around the Peace Memorial Museum.
1991 August To improve the displays, the Peace Memorial Museum is renovated and the exhibits redesigned.
1994 June Peace Memorial Hall is renovated to improve display and collection functions and to provide more space for peace education. The second floors of Peace Memorial Hall and the Peace Memorial Museum are integrated into the new Hiroshima Peace Memorial Museum (East Building and Main Building).
¡East Buildingcc Tells the story of Hiroshima before and after the atomic bombing.
¡Main Buildingcc Tells the story of August 6 using photographs, the belongings of A-bomb victims, and other artifacts.