Rolling bearing

A rolling bearing comprising:

• an outer ring made of steel;
• an inner ring made of steel having a common central axis with the outer ring and arranged on an inner circumferential side of the outer ring;
• and
• a plurality of rolling elements arranged so as to be rollable on an inner circumferential surface of the outer ring and an outer circumferential surface of the inner ring;
• the outer ring including
• a first outer ring, and a second outer ring arranged alongside the first outer ring in a first axis direction in which the central axis extends and fixed to the first outer ring,
• the inner ring including
• a first inner ring, and a second inner ring arranged alongside the first inner ring in the first axis direction and fixed to the first inner ring,
• the first outer ring, the second outer ring, the first inner ring, and the second inner ring each including
• a first portion which is a disk annular portion extending in a direction orthogonal to the first axis direction,
• a second portion connected to the first portion and having a circumferential surface constituting an annular rolling surface, and
• a third portion connected to the second portion and including a tubular portion extending along the first axis direction,
• the third portions of the first inner ring and the second inner ring having end surfaces spaced from and opposed to inner circumferential surfaces of the tubular portions of the third portions of the first outer ring and the second outer ring, respectively.