| 摘要 |
Provided is a contact member that comes in contact with an inner surface of a cylindrical member being rotated to press against the inner surface, is supported within the cylindrical member, is provided along the inner surface when viewed in an axial direction of the cylindrical member while being supported by the cylindrical member, has an arc shape in which both ends thereof face each other, and has first thin-wall regions which are respectively formed at both ends thereof in a circumferential direction to have thicknesses lower than thicknesses of other regions. |
