| 摘要 |
<p>A motion device (1) comprises a track body (10), a movement body (21), rolling bodies (70), and center retainers (81) disposed on the movement body (21) and covering the rolling bodies (70) or rolling body connectors (72). The movement body (21) has side through-holes (24) each extending from between rolling body rolling surfaces (28) toward an outer side surface (21k). The center retainers (81) integrally have filling and closing sections (84) for closing the side through-holes (24).</p> |
