Patent ID: 8565652

Claim:
A development roller, comprising: a magnet roller; and a rotatably supported development sleeve including inside thereof the magnet roller, wherein the development sleeve is formed in a cylindrical shape and configured such that a shaft center of the cylindrical shape is inconsistent with a rotation axis of the development sleeve, the development sleeve includes an outer surface provided with plural circular or elliptical depressions in a planar view, the depressions being regularly arranged at intervals, and in a cross-sectional plane taken at a specific position along, and normal to, the rotation axis, a depth of a depression, amongst a plurality of depressions intersected by the cross-sectional plane, that is provided in a portion of the outer surface relatively closer to the rotation axis is larger than a depth of another depression, amongst the plurality of depressions intersected by the cross-sectional plane, that is provided in a portion of the outer surface relatively farther from the rotation axis.