Developer carrying member and method for manufacturing the same

A developer carrying member comprising:

• a shaft that extends in a predetermined direction;
• a magnet that is fixed to an outer circumferential surface of the shaft;
• a sleeve that is cylindrical with the shaft being a center axis and carries a developer on an outer circumferential surface;
• a flange that
• is fixed to an end opening of the sleeve in the predetermined direction,
• is rotatably supported to the shaft and
• is rotated around the center axis together with the sleeve;
• and
• an adhesive that bonds the sleeve and the flange,
• wherein the flange includes a cylindrical fitting portion that is fitted into the sleeve through the end opening,
• the fitting portion includes
• a first support portion that is in contact with an inner circumferential surface of the sleeve,
• a second support portion that
• has a same outside diameter as an outside diameter of the first support portion, and
• is in contact with the inner circumferential surface of the sleeve a position on a side of the end opening relative to the first support portion and
• a groove portion that
• is formed between the first support portion and the second support portion in the predetermined direction, and
• is recessed in a radial direction relative to each of outer circumferential surfaces of the first support portion and the second support portion,
• the adhesive is disposed in the groove portion and
• when accuracy of runout required during rotation of the sleeve is R (μm), a length of the sleeve in the predetermined direction is L (mm), a distance in the predetermined direction from an end of the first support portion on a side opposite to the side of the end opening to an end of the second support portion on the side of the end opening is S (mm) and each of the outside diameters of the first support portion and the second support portion is D (mm), a value of the R is 50, and R>L/(S×D)×1.9 is satisfied.