an image formation device includes an image - bearing body that rotates , a charging roller that contacts the image - bearing body and is rotated by the rotation of the image - bearing body , and charges the image - bearing body , a cleaning roller that contacts the charging roller and is rotated by the rotation of the charging roller , and cleans the charging roller , and a first auxiliary roller that is provided coaxially with the charging roller , contacts the image - bearing body and is rotated by the rotation of the image - bearing body . the image formation device satisfies the following relation : f1 & gt ; f2 & gt ; f3 where f 1 represents a friction force between the first auxiliary roller and the image - bearing body , f 2 represents a friction force between the image - bearing body and the charging roller and f 3 represents a friction force between the charging roller and the cleaning roller .