In the capital Tokyo, 206 infections were reported on Sunday, the fourth straight day that cases have topped 200.
The western city of Osaka also reported an uptick in infections, with 32 cases.
This figure does not include the 62 cases detected on US military bases in Okinawa between July 7 to 12, which are all US personnel and their families, according to the Okinawa prefecture local government.
The total number of people infected by the virus in the country stands at 22,580, with 995 deaths.