Patent ID: 7076185

Claim:
A developing device comprising: a developer containing section for containing developer; a developing roller for bearing the developer; a restriction blade for restricting the developer bore by said developing roller; an end seal for preventing the developer from spilling through a gap between an end of said restriction blade and said developer containing section and for preventing the developer from spilling through a gap between an end of said developing roller and said developer containing section; and a seal-assisting member for pressing said end seal against the end surface of said restriction blade, wherein a sealing unit is provided with said restriction blade and said end seal, said restriction blade being in an unbent state and said end seal abutting against said end surface of said restriction blade in a non-compressed state before said sealing unit is assembled with a housing and said developing roller; and when said sealing unit is assembled with said housing and said developing roller, said restriction blade is brought into a bent state to abut against said developing roller and said end seal is brought into a compressed state to prevent the developer from spilling.