Cleaning device and image forming apparatus

A cleaning device comprising:

• a housing that has an opening opposite an annular belt, which has an outer circumferential surface, end portions, and side surfaces, and which is supported by a roller having axial end portions and rotated in a rotational direction, the opening being opposite the outer circumferential surface of the belt in an axial direction of the belt;
• a plate-shaped cleaning member that has longitudinal end portions, that is attached to the housing so as to close part of the opening, that is in contact with, in the axial direction of the belt, the outer circumferential surface at a portion of the belt supported by the roller, and that removes toner adhering to the outer circumferential surface of the belt;
• soft sealing members that are formed of soft elastic bodies and have respective contact portions which are in contact with the outer circumferential surface of the belt and have respective upstream end portions in the rotational direction of the belt, the soft sealing members being secured to the housing so as to be in contact with parts of the respective longitudinal end portions of the cleaning member;
• and
• hard sealing members that are secured to the housing so that each of the hard sealing members is arranged side by side with a corresponding one of the soft sealing members on a side opposite to the cleaning member relative to the soft sealing member, the hard sealing members having respective contact portions which have upstream end portions in the rotational direction of the belt and are in contact with the side surfaces and the outer circumferential surface at the end portions of the belt, which project outward beyond the axial end portions of the roller, the hard sealing members being formed of hard elastic bodies harder than the soft elastic bodies.