| 摘要 |
A cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes a developer accommodating portion for accommodating a developer; a developing roller for developing an electrostatic latent image formed on an electrophotographic photosensitive drum with the developer accommodated in the developer accommodating portion; a coupling member for receiving a rotational force for rotating the developing roller from the main assembly, in a state in which the cartridge is mounted to the main assembly; a cylindrical member movably supporting one end portion of the coupling member inside of the cylindrical member; a cylindrical member side force receiving portion, provided inside the cylindrical member, for receiving the rotational force received from the main assembly by the coupling member; a gear, provided on an outer periphery of the cylindrical member, for transmitting the rotational force received by the cylindrical member side force receiving portion to the developing roller; a first regulating portion, provided inside of the cylindrical member and deformable in a radial direction of the cylindrical member, for preventing one end portion of the coupling member from disengaging in an axial direction of the cylindrical member; and a second regulating portion for regulating deformation of the first regulating portion in a state in which one end portion of the coupling is mounted to an inside of the cylindrical member with deformation of the first regulating portion.
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