Rolling bearing, rotating device, and method for manufacturing rolling bearing

A rolling bearing comprising:

• an inner ring and an outer ring that are disposed coaxially with each other;
• a rolling body that is disposed between the inner ring and the outer ring;
• and
• a resin cover that is mounted on one bearing ring of the inner ring and the outer ring, wherein the one bearing ring comprises:
• a circumferential surface that faces an opposite side of the other bearing ring of the inner ring and the outer ring;
• and
• an end surface that faces an axial direction,
• the resin cover comprises:
• a circumferential wall portion that covers the circumferential surface;
• and
• a flange portion that is connected to the circumferential wall portion and covers the end surface, wherein the flange portion has an opening portion formation region that has a constant width in a radial direction, extends over an entire circumference, and is formed with opening portions that expose the end surface.