Patent ID: 7706724

Claim:
A charging-roller bearing member for an image forming apparatus including an image carrier drum rotatably supported by side walls of a casing in such a manner that a perimeter surface of the image carrier drum is rotatable and a charging unit that uniformly charges the perimeter surface of the image carrier drum in the same casing, wherein the charging unit is a charging roller, and the charging-roller bearing member comprises: a first bearing member fitting in a first side of a rotating shaft of the charging roller in an axial direction; and a second bearing member fitting in a second side of the rotating shaft in the axial direction, wherein the first bearing member and the second bearing member are arranged opposite to each other along a rotating direction of the perimeter surface of the image carrier drum, the first bearing member is held by a supporting portion provided in the casing on a side corresponding to an emplacing member of the image carrier drum, the second bearing member is held by fitting in a fit-in portion from inside, the fit-in portion being formed on an exterior side wall of the casing on a side in a longitudinal direction of the image carrier drum where the emplacing member is not positioned, and a first wall surface that regulates the charging roller in a longitudinal direction is formed on the second bearing member in a protruding manner from a second wall surface rotatably and pivotally supporting the charging roller.