| 摘要 |
A hub unit comprising an outer member (31), an inner member (32, 33) and a plrality of rolling elements. Said rolling element (34) being configured of a sintered body that contains as a main component a ²-sialon represented by a compositional formula of Si 6-Z Al Z O Z N 8-Z and satisfying 0.1 ‰¤ z ‰¤ 3.5 and has a remainder formed of an impurity. |
