Ball bearing assembly method and assembly device, and ball bearing produced using said assembly method

A ball bearing assembly device to insert a plurality of balls into a gap space between an outer ring raceway surface and an inner ring raceway surface, the device comprising:

• an inner and outer ring holding unit which holds an outer ring and an inner ring in a state where the outer ring raceway surface and the inner ring raceway surface are eccentric to each other on a same plane so as to form the gap space;
• a stocker in which the plurality of balls are aligned;
• a ball holding mechanism which releasably holds a ball;
• a robot arm which includes an arm tip arranged with the ball holding mechanism and is capable of moving to a designated position;
• and
• a control unit which drives the robot arm and the ball holding mechanism based on a control program in which a ball insertion position in the gap space is set according to a kind of the ball bearing,
• wherein the control unit controls the ball holding mechanism to hold any ball from the stocker, controls the robot arm to transport the held ball to the set ball insertion position in the gap space, and controls the ball holding mechanism to release the holding of the ball in a state where the held ball is inserted in the gap space.