A developer charging unit comprises a developer charging member for charging
developer
bore by a developer bearing member by abutting against the developer bearing member;
a supporting member for supporting the developer charging member; and a plurality
of fixing portions for fixing the developer charging member and the supporting
member together, the fixing portions being lined up according to a predetermined
arrangement. A spacing between two of the fixing portions located in a central
section in a longitudinal direction of the developer charging member is shorter
than a spacing between two of the fixing portions located at an end section in
the longitudinal direction of the developer charging member.