Bearing groove diameter measuring method and bearing groove diameter measuring device, manufacturing method for rolling bearing, and manufacturing methods for machine and vehicle

A bearing groove diameter measuring device comprising:

• a support member that supports a ring-shaped member having a raceway groove formed on an inner circumferential surface or outer circumferential surface, and coming into contact with a groove bottom surface of the raceway groove to support a weight of the ring-shaped member while a central axis of the ring-shaped member is disposed horizontally;
• a movable probe that is disposed to be movable and placed on the groove bottom surface of the ring-shaped member supported by the support member;
• a sensor that measures a height position of the movable probe in a state in which the movable probe is placed on the groove bottom surface;
• and
• a calculation unit that calculates a groove diameter of the raceway groove based on a measurement result of the height position.