Guide roller for vehicle sliding door

A guide roller for a vehicle sliding door, the guide roller being configured to roll along a rail located on a vehicle body, the guide roller being pivotally supported in a rotatable manner by a support member coupled to the vehicle sliding door, the guide roller comprising:

• a ring-shaped inner race made of a metal;
• a ring-shaped outer race made of a metal, the outer race being rotatably mounted on an outer peripheral surface of the inner race via a retainer configured to hold a bearing;
• and
• a covering member made of a synthetic resin, the covering member being mounted on an outer peripheral surface of the outer race,
• wherein the outer peripheral surface of the outer race has two eccentric grooves extending in a circumferential direction, the two eccentric grooves having eccentric centers that are positioned point-symmetrically with respect to a rotation axis center of the outer race, each of the two eccentric grooves having a groove depth varying in the circumferential direction from the outer peripheral surface,
• wherein the two eccentric grooves are separated from each other in an axial direction of the outer race,
• wherein the outer race includes, on the outer peripheral surface of the outer race between the two eccentric grooves, a concentric groove concentric with the rotation axis center of the outer race, and
• wherein the covering member is formed to cover the outer peripheral surface of the outer race, the two eccentric grooves, and the concentric groove-or the concentric ridge portion.