Patent ID: 7844202

Claim:
A constant velocity joint comprising: a first rotation body including a cup-shaped cup unit formed by opening one end in an axis direction of an annular space created between an outer ring and an inner ring inside the outer ring while closing other end thereof; a plurality of grooves provided on at least one of an inner surface of the outer ring and an outer surface of the inner ring so as to be aligned in a circumferential direction while extending in the axis direction; and a second rotation body including a ball holder that holds a ball in each of a plurality of through holes, the through holes being provided on a cylindrical peripheral wall so as to be aligned in a peripheral direction thereof, wherein a rotational driving force of one of the first rotation body and the second rotation body is transmitted to the other one of the first rotation body and the second rotation body through the plurality of balls while the ball holder is inserted into the annular space and the balls held by the ball holder are engaged in the grooves within the annular space, and the outer ring has a multi-layered structure including an innermost layer that is formed of resin material and that defines the inner surface and a metal layer that is formed of metal material and that is positioned outside the innermost layer.