A cartridge mountable, along a predetermined mounting path, to a main assembly of an electrophotographic image forming apparatus including a photosensitive member on which a latent image is capable of being formed and including a main assembly driving shaft, wherein said cartridge is movable in the main assembly between a developing position at a terminal end of said mounting path and a retracted position retracted from the developing position in a direction different from the mounting path, said cartridge comprising: a developer carrying member capable of developing the latent image while being in contact with the photosensitive member when said cartridge is in the developing position; a coupling member capable of inclining relative to a rotational axis of said developer carrying member, wherein said coupling member is capable of taking a reference attitude in which a drive transmission is possible from the main assembly driving shaft to said developer carrying member when said cartridge is in the developing position, an at-mounting attitude inclined relative to the rotational axis of said developer carrying member to engage with the main assembly driving shaft when said cartridge moves along the mounting path, and an at-spaced attitude inclined relative to the rotational axis of said developer carrying member in a direction different from that in the at-mounting attitude, wherein the reference attitude, the at-mounting attitude and the at-spaced attitude refer to different inclination attitudes of said coupling member; and an urging portion (185d, 3185c, 3185d, 4185c, 4185d, 5185d, 6185d, 7185d, 8185e, 9185e, 10185e, 11185d, 12185c) for applying an urging force to incline said coupling member relative to the rotational axis of said developer carrying member and to urge said coupling member to the at-spaced attitude or the at-mounting attitude, characterized in that the cartridge further comprises a movable portion (55e, 355a, 455a, 555c, 655c, 755c, 855c, 955c, 10185g, 1155c2, 1255c2) being different from the urging portion (185d, 3185c, 3185d, 4185c, 4185d, 5185d, 6185d, 7185d, 8185e, 9185e, 10185e, 11185d, 12185c) and capable of taking a first movement position for causing said coupling member to take the at-spaced attitude and a second movement position for causing said coupling member to take the at-mounting attitude. a developer carrying member capable of developing the latent image while being in contact with the photosensitive member when said cartridge is in the developing position; a coupling member capable of inclining relative to a rotational axis of said developer carrying member, wherein said coupling member is capable of taking a reference attitude in which a drive transmission is possible from the main assembly driving shaft to said developer carrying member when said cartridge is in the developing position, an at-mounting attitude inclined relative to the rotational axis of said developer carrying member to engage with the main assembly driving shaft when said cartridge moves along the mounting path, and an at-spaced attitude inclined relative to the rotational axis of said developer carrying member in a direction different from that in the at-mounting attitude, wherein the reference attitude, the at-mounting attitude and the at-spaced attitude refer to different inclination attitudes of said coupling member; and an urging portion (185d, 3185c, 3185d, 4185c, 4185d, 5185d, 6185d, 7185d, 8185e, 9185e, 10185e, 11185d, 12185c) for applying an urging force to incline said coupling member relative to the rotational axis of said developer carrying member and to urge said coupling member to the at-spaced attitude or the at-mounting attitude, characterized in that the cartridge further comprises a movable portion (55e, 355a, 455a, 555c, 655c, 755c, 855c, 955c, 10185g, 1155c2, 1255c2) being different from the urging portion (185d, 3185c, 3185d, 4185c, 4185d, 5185d, 6185d, 7185d, 8185e, 9185e, 10185e, 11185d, 12185c) and capable of taking a first movement position for causing said coupling member to take the at-spaced attitude and a second movement position for causing said coupling member to take the at-mounting attitude.