A ceremony was held on Saturday to mark the completion of the Tokyo Aquatics Centre, which will host swimming competitions in next year's Olympic and Paralympic Games.
The metropolitan government spent about 540 million dollars to build the venue, where 15,000 seats, including temporary ones, will be set up for the games.
Organizers of the Tokyo Olympics have unveiled a new competition schedule for the Games, which were postponed to next year due to the coronavirus pandemic.
The head of the Tokyo Organising Committee, Mori Yoshiro, made the announcement during a video conference of the International Olympic Committee on Friday.
A senior official of the Tokyo Olympic and Paralympic organizing committee says a final decision on whether to hold the Games or not can wait until sometime between March and June next year.
Endo Toshiaki, special representative of the committee's president, was speaking to reporters after he met Prime Minister Abe Shinzo in Tokyo on Wednesday.
An NHK survey shows that about two-thirds of corporate sponsors of the Tokyo 2020 Olympics and Paralympics have not decided whether to extend their contracts with the Organizing Committee beyond December, following the Games' postponement to 2021.
NHK conducted a survey of 78 Olympic and Paralympic sponsor companies in May, and 57 of them responded.
NHK has learned that the International Olympic Committee plans to finalize in September a new plan for the 2020 Tokyo Games. The coronavirus pandemic forced organizers to push back the Games by one year.
The Tokyo Olympics are now scheduled to open in July next year. It is estimated that the postponement will cost several billion dollars.