He urged the abolition of nuclear weapons, in a year when President Donald Trump pledged to increase the USA nuclear arsenal.
"If the human family forgets history or stops confronting it, we could again commit a awful error", Matsui said.
Now it is safe to say that no one wants a repeat of what happened at Hiroshima, plus given today's weapons, we imagine that the fallout would be considerably worse.
"Efforts to eliminate nuclear weapons must continue".
Matsui expressed hope that the easing of tensions on the Korean Peninsula will continue through dialogue and called on global leaders to make an worldwide treaty comprehensively prohibiting nuclear weapons a "milestone" toward the goal of ridding the world of nuclear arsenals.
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The Treaty on the Prohibition of Nuclear Weapons was approved by the United Nations in July previous year and the group played a key role in campaigning for the treaty, the International Campaign to Abolish Nuclear Weapons (ICAN), received the 2017 Nobel Peace Prize.
The Hiroshima mayor regarded the nuclear weapons ban treaty as "a milestone along the path to a nuclear-weapon-free world", urging the government of Japan to play a role to help bring it into force. Japan, which hosts USA troops on its land and is covered by the U.S. nuclear umbrella protecting it from attack, has not signed the treaty.
The mayor called on the Japanese government to lead the global community towards "dialogue and cooperation for a world without nuclear weapons".
The 73rd anniversary comes after Pyongyang's promise of a complete denuclearization of the Korean Peninsula grabbed attention following the historic U.S.
"We in civil society fervently hope that the easing of tensions on the Korean Peninsula will proceed through peaceable dialogue, " he said.
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Prime Minister Shinzo Abe, who also was at the ceremony, reiterated Japan's pledge to maintain its pacifist and non-nuclear principles.
Speaking at the ceremony, Abe said Japan will try to act as a bridge between nuclear powers and non-nuclear states and lead worldwide efforts for a world without nuclear weapons.
Russell Gackenbach was told one thing about the mission he was about to embark on: It could end World War II.
For example, the Imperial Japanese Army's notorious Unit 731, which was based in the Pingfang district of Harbin, the largest city then in northeast China, was set up around 1936 and conducted vivisection experiments on live human beings to test germ-releasing bombs and chemical bombs, among other criminal atrocities.
Tomie Makita, 88, of Hiroshima pays a visit to the park every year on August 6 to remember the bombing that claimed the lives of her friends.
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