Tsutomu Yamaguchi, the only official survivor of both atomic blasts to hit Japan in World War II, died Monday in Nagasaki, Japan. He was 93.

The cause was stomach cancer, his family said.

Mr. Yamaguchi, as a 29-year-old engineer for Mitsubishi Heavy Industries, was in Hiroshima on a business trip when the United States dropped the first atomic bomb on the morning of Aug. 6, 1945. He was getting off a streetcar when the so-called Little Boy device detonated above the city.

Mr. Yamaguchi said he was less than two miles away from ground zero that day. His eardrums were ruptured, and his upper torso was burned by the blast, which destroyed most of the city’s buildings and killed 80,000 people.

Mr. Yamaguchi spent the night in a Hiroshima bomb shelter and returned to Nagasaki, his hometown, the following day, according to interviews he gave over the years. The second bomb, known as Fat Man, was dropped on Nagasaki on Aug. 9, killing 70,000 people.

Mr. Yamaguchi was in his Nagasaki office, telling his boss about the Hiroshima blast, when “suddenly the same white light filled the room,” he said in an interview last March with the British newspaper The Independent.

“I thought the mushroom cloud had followed me from Hiroshima,” he said.

Japan surrendered six days after the Nagasaki attack.

Mr. Yamaguchi recovered from his wounds, went to work for the American occupation forces, became a teacher and eventually returned to work at Mitsubishi.

There were believed to have been about 165 twice-bombed people, known as nijyuu hibakusha, although municipal officials in both cities have said that Mr. Yamaguchi was the only person to be officially acknowledged as such.

One of his daughters, Toshiko Yamasaki, who was born in 1948, said her mother had also been “soaked in black rain and was poisoned” by the fallout from the Nagasaki blast. Her mother died in 2008 from kidney and liver cancer. She was 88.

“We think she passed the poison on to us,” Ms. Yamasaki said, noting that her brother died of cancer at 59 and that her sister has been chronically ill throughout her life.

In his later years Mr. Yamaguchi spoke out against atomic weapons, though he had earlier avoided joining antinuclear protests because of the attention he might have attracted, Ms. Yamasaki told The Independent. “He was so healthy, he thought it would have been unfair to people who were really sick,” she added.

Mr. Yamaguchi rarely gave interviews, but he wrote a memoir and was part of a 2006 documentary about the double bombing survivors. He called for the abolition of nuclear weapons at a showing of the documentary, “Niju Hibaku” (“Twice Bombed”), at the United Nations that year.

At a lecture he gave in Nagasaki last June, Mr. Yamaguchi said he had written to President Obama about banning nuclear arms. And he was recently visited by the American film director James Cameron to discuss a film project on atomic bombs, Ms. Yamasaki said.

Mr. Yamaguchi was philosophical about his surviving the blasts. “I could have died on either of those days,” he told The Mainichi Daily News of Japan in August. “Everything that follows is a bonus.”

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