| 摘要 |
A roller member includes a cylindrical core bar. The roller member is rotatably supported at both ends, and forms a nip, to which a recording medium is conveyed, by making a contact with another member. The core bar satisfies 1.0≦̸&Dgr;D/D1×100≦̸3.0, where D1 is an outer diameter of the core bar in millimeters and &Dgr;D is an outer diameter deformation value of a convey direction in millimeters.
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