The former high school principal and father of five children died of kidney failure in a care facility on Sunday.
Local media said Momoi died at a care home in Tokyo where he had lived for many years.
A local official said. “We heard from his family that his health worsened one or two weeks ago.”
He was born in Fukushima, an area badly hit by the deadly magnitude earthquake and tsunami in 2011 that caused the world worst nuclear crisis in a generation.
Momoi was born the year the “teddy bear” was introduced and the “Wright brothers” made their first powered flight.
He was 42 when the Second World War ended.
Momoi received a certificate from Guinness World Records confirming the achievement last year in August 2014.
Dressed in a black suit, white shirt and silver tie, he told reporters: “I want to live for about two more years.”
He enjoyed reading, especially Chinese poetry, and also travelling around Japan with his late wife, according to Guinness.
Guinness has not announced who is now the world’s oldest man, although it may well be 112-year-old Japanese Yasutaro Koide who was born a month after Mr Momoi.
The oldest person who has ever lived according to Guinness was Jeanne Calment of France, who lived 122 years and 164 days. She died in August 1997.
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