Roller cover and cartridge

A roller cover, which is to be attached to a housing of a cartridge, which accommodates developer and comprises a roller of which a circumference is exposed through an opening longitudinally 5 formed in the housing,

• the roller cover comprising:
• a protecting portion, which extends longitudinally in an axial direction of the roller, and which faces the circumference of the roller when the roller cover is attached to the housing;
• a first end portion, which is provided at one side of the protecting portion in an orthogonal direction, wherein the orthogonal direction is orthogonal to the axial direction;
• and wherein the orthogonal direction is also orthogonal to a facing direction, which is a direction between the roller and the protecting portion;
• a second end portion, which is provided at one other side of the protecting portion in the orthogonal direction;
• a first opposite portion, which is formed continuously with the first end portion, wherein the first opposite portion is fitted to one side of the housing in the orthogonal direction when the roller cover is attached to the housing;
• and
• a second opposite portion, which is formed continuously with the second end portion, wherein the second opposite portion is fitted to the other side of the housing in the orthogonal direction when the roller cover is attached to the housing,
• wherein a first distance between the first opposite portion and the second opposite portion increases during an attachment operation, and
• wherein, when the attachment operation is completed, a final distance between the first opposite portion and the second opposite portion is less than maximum value of the first distance.