Patent ID: 7912402

Claim:
A developing device comprising: a developer container that contains developer, the developer container being formed with an opening for providing the developer; a developing roller that is rotatably supported by the developer container at a predetermined position to be disposed along the opening, the developing roller including: a roller shaft; and an elastic roller supported by the roller shaft, the elastic roller being configured to carry the developer provided through the opening; leakage preventing members that are made of elastic material and prevent leakage of the developer at longitudinal end portions of the elastic roller, each of the leakage preventing members being respectively disposed at portions where the longitudinal end portions oppose the developer container, to extend in an extending direction along a circumferential surface of the elastic roller at a longitudinal end portion thereof; a guide that is provided on the developer container and slidably guides the developing roller toward the predetermined position along a sliding direction that is defined along the extending direction to allow the developing roller to be attached to the developer container; and an attached member that is attached to the developer container at the vicinity of the predetermined position, wherein the guide guides the developing roller while the elastic roller presses each of the leakage preventing members toward a first attached member.