1. The electrophotographic photosensitive drum unit (B) used with the main assembly of the electrophotographic image forming apparatus, where the main assembly includes a drive shaft (180) driven by an electric motor and having a rotational force applying portion, the electrophotographic photosensitive drum assembly being removed from the main assembly in a direction of removal substantially perpendicular to the axial direction (L3) of the drive shaft, wherein the electrophotographic photosensitive unit itelnogo drum comprises: i) an electrophotographic photosensitive drum (107) having a photosensitive layer (1076) on its peripheral surface, wherein the electrophotographic photosensitive drum is rotatable about its axis (L1); and ii) a connecting element (150) rotatable around its axis (L2) and engaged with the drive shaft (180) for receiving a rotational force from the rotationally applying part to rotate the electrophotographic photosensitive drum (107), and the connecting element (150) is provided on the axial end of the electrophotographic photosensitive drum (107), so that the connecting element is able to take the angular position of the transmission of rotational forces, essentially coaxial with said axis (L1) electrophotographic of the photosensitive drum (107), for transmitting rotational force to the electrophotographic photosensitive drum (107) for its rotation, and the angular disengagement position, in which the connecting element (150) deviates from the axis (L1) of the electrophotographic photosensitive drum (107) from the aforementioned
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