Earlier in the day, at the city's Haneda airport, the red carpet was rolled out as Crown Prince Naruhito of Japan received the British royals.
The heir to the Chrysanthemum throne was not accompanied by his wife Masako, who has largely stayed out of the public spotlight since her diagnosis with a nervous illness.
An imperial reception is planned, however, as Naruhito's parents, Emperor Akihito and Empress Michiko, have invited Charles and his wife to dinner.
The five-day visit – the Prince's third – also includes an expedition to Nara, an ancient city in the west of the country where some of Japan's most famous Buddhist temples are located, as well as to the central mountain town of Nagano.
Charles will then travel to Brunei and Indonesia, while the Duchess returns to the UK after the Brunei leg of the trip, thus avoiding the stifling heat in Jakarta.
