Developing device and blade assembly

摘要

A developing device includes: a developing roller, a casing (62) which rotatably supports the developing roller; a thickness regulation blade (110); and first and second holding members (120,130) which fix the thickness regulation blade on the casing. The first holding member includes: a first nipping surface (121A) which contacts the thickness regulation blade; and a first fixing surface (122A). The second holding member includes: a second nipping surface (131A) which opposes the first nipping surface; and a second fixing surface (132A) contacting the first fixing surface. The thickness regulation blade includes a positioning opening (113) and is sandwiched between the first nipping surface and the second nipping surface. The first nipping surface includes a projection (123) which is fitted into the positioning opening of the thickness regulation blade.