In Chiba Prefecture, 5,075 people were newly infected with the new coronavirus on the 15th.
Nearly 2,000 fewer people than on Monday a week ago.
On the other hand, it was announced that the eight people announced from the 27th to the 14th of last month would be excluded from the infected.
The total number of infected people has reached 742,075.
In addition, 15 new deaths were announced, including boys under the age of 10 and men and women over the age of 70.
A total of 2,033 people have died.