| 摘要 |
<p>A cage is formed of a plurality of spacers (30) that are arranged along a circumference of the same circle. Each spacer (30) includes: first, second and third cage bars (51, 52 and 53) extending in an axial direction of the circle and located at intervals from each other; a first coupling portion (57) that couples an end portions of the first and second cage bars (51 and 52) at one of the axial direction; and a second coupling portion (58) that couples the other end portions of the second and third cage bars (52 and 53) at the other one of the axial direction. The first cage bar (51), the second cage bar (52) and the first coupling portion (57) define a first pocket (80) that is open at the other one of the axial direction side, and the second cage bar (52), the third cage bar (53) and the second coupling portion (58) define a second pocket (81) that is open at the one of the axial direction side.
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