The Tokyo Metropolitan Government confirmed 82 new cases of the coronavirus in the capital on Saturday.
The figure is 114 fewer than a week ago, and the lowest this year.
The seven-day average up to Saturday was 129.1, or 16.3 lower than the average through Friday, which fell below 150 for the first time in almost a year.
Tokyo officials say 68 patients are in serious condition, the same as on Friday.
They say nine people died.