End member, photosensitive drum unit, developing roller unit, and process cartridge

An end member to be disposed at an end portion of a columnar rotating body mounted on an image forming apparatus body, the end member comprising:

• a tubular bearing member;
• and
• a shaft member held by the bearing member, wherein
• the shaft member includes:
• a shaft-like rotating shaft which is disposed coaxially to the bearing member, and which rotates around a shaft line with respect to the bearing member to move in a direction of the shaft line;
• and
• a tip end member which is disposed coaxially to the rotating shaft, and at which a rotating force receiving member having a tip end provided with an engaging member which engages with a driving shaft of the image forming apparatus body is disposed, and
• a rotating force around the shaft line is transmitted to the rotating force receiving member, the rotating shaft, and the bearing member in order,
• wherein a part formed in a spiral shape is provided on an inner surface of the rotating shaft, and a member which moves inside the part formed in the spiral shape is provided in the tip end member, whereby the tip end member rotates around the shaft line with respect to the rotating shaft to move in the shaft line direction.