That would mark the first time in almost four hundred years that a Japanese emperor has not been buried, according to the Imperial Household Agency.
It added that the 79-year-old emperor's wife, Empress Michiko, would also be cremated.
The agency, which runs the affairs of Japan's revered imperial family, said the couple were concerned about limited space in Tokyo's royal graveyard.
"Cremation has become a common practise in Japan and imperial history has seen both cremations and burial," the palace said in a statement.
The imperial couple's remains would be placed into a pair of relatively modest, yet-to-be-constructed tombs in the graveyard where wartime Emperor Showa, his father Emperor Taisho and their wives were buried.
