Rolling bearing and bearing structure including same

A rolling bearing comprising:

• an outer ring;
• an inner ring for retaining a rotary shaft;
• rolling elements between the outer ring and the inner ring;
• and
• a cage rotatably retaining the rolling elements, and configured to be guided by the outer ring,
• wherein the cage has an endless annular shape, when the cage is seen in an axial direction,
• wherein the cage includes, on an outer peripheral surface of the cage, a plurality of ridges protruding outwardly in a radial direction, and spaced apart from each other in a circumferential direction at intervals within the range of 0.3 mm or more and 2.6 mm or less,
• wherein each of the ridges extends either in the axial direction or in an oblique direction or directions relative to the circumferential direction, and
• wherein the ridges are capable of coming into contact with an inner peripheral surface of the outer ring through lubricating oil.