The Rugby World Cup organizing committee says more than 426,000 people have attended the 12 matches played in the first week of the competition, which began in Japan on September 20.
The average number of spectators per game is about 35,000.
There were 63,731 spectators at the match between Ireland and Scotland at the International Stadium Yokohama on September 22.
There were 63,649 spectators at the match between New Zealand and South Africa in Yokohama on September 21.
According to the organizing committee, 97 percent of the 1.8 million tickets have already been sold.
A total of 270,000 people have visited fan zones, where the games can be viewed in public, at 16 locations across Japan.
The competition will continue through November 2, with a total of 48 matches at 12 venues.
Japan, which caused a major upset at the previous World Cup in England by beating South Africa, is aiming to reach the last eight for the first time ever.
New Zealand aims to be the first team to win a third straight World Cup.