To provide a thrust bearing having advantage in cost, having a simple structure, and being suitable for keeping good lubricity on the surface of a rolling element for a long period.

In this thrust bearing, a large diameter ball 60 is received by a small diameter ball group composed of a plurality of small diameter balls, and each small diameter ball 50 of the small diameter ball group is allowed to roll and circulate on a ball moving passage with rolling of the large diameter ball 60. On an inner peripheral surface of a lower induction part 40 which contacts with the large diameter ball 60, a groove 62 is horizontally formed along a circumferencial direction of the large diameter ball 60, and the groove 62 is filled with a lubricant supplying member 80 made of lubricant including polymer.