Developing device and image forming apparatus containing regulated bearing

A process cartridge comprising:

• an image bearer;
• a developer to develop a latent image formed on a surface of the image bearer, the developer including a rotator with a rotation shaft;
• a bearing to support the rotation shaft;
• a holder to hold the bearing;
• a first regulator, disposed on the bearing, to regulate movement of the bearing moving toward one end side in an axial direction of the rotation shaft relative to the holder;
• and
• a second regulator configured to regulate movement of the bearing moving toward another end side in the axial direction relative to the holder after the bearing is attached to the holder,
• wherein the second regulator is on the holder such that the second regulator does not contact the bearing when the bearing is attached to the holder, and is deformed to contact the bearing after the bearing is attached to the holder.