Patent ID: 7974549

Claim:
A developing device comprising: a developing roller on a surface of which intersecting inclined grooves are formed by rolling working; and a seal member which comes into contact with the developing roller, wherein ridge portions of a convex portion surrounded by the inclined grooves of the surface of the developing roller are formed such that rotational resistance due to the contact of the seal member on the downstream side of a rotation direction opposite to a rotation direction of the developing roller at the time of development is larger that rotational resistance due to the contact of the seal member on the downstream side of a rotation direction of the developing roller at the time of development, at the time of refreshing of the seal member, the developing roller is rotated in the opposite direction to a direction at the time of development, and burrs are formed on the ridge portions of the convex portion on the upstream side of the rotation direction of the developing roller at the time of development.