Cage for rolling bearing

A cage for coupling to a rolling bearing including an inner ring, an outer ring and a plurality of rolling elements rolling between the inner ring and the outer ring and for keeping predetermined intervals of the plurality of rolling elements, the cage comprising,

• a first piece and a second piece which are attachable to each other along a mutual circumference and detachable from each other, and when attached to each other, accommodate the plurality of rolling elements at predetermined intervals around the mutual circumference of the first piece and the second piece;
• wherein a first coupler and a second coupler configured to be capable of being coupled to each other are respectively formed at the first piece and the second piece, and the first piece and the second piece are primarily coupled by means of a coupling force of the first coupler and the second coupler, and
• wherein the second coupler is a cylindrical protrusion having a uniform diameter and the first coupler is a corresponding cylindrical concavity having a uniform diameter that is smaller than the uniform diameter of the second coupler.