Sliding door device for vehicle

A sliding door apparatus for a vehicle, the sliding door apparatus comprising:

• a door panel configured to open or close a door opening formed in a vehicle body;
• a center rail mounted on a center portion of the door panel to extend in a longitudinal direction of the vehicle body;
• a center roller;
• an upper trim provided at an upper side of the vehicle body and a lower trim provided at a lower side of the vehicle body;
• and
• a center roller mounting bracket,
• wherein the center rail provides a path for the center roller mounted on a center portion of the vehicle body to move therealong,
• wherein the door panel is covered by the upper trim at the upper side of the vehicle body and the lower trim at the lower side of the vehicle body,
• wherein a lower portion of the upper trim and an upper portion of the lower trim are disposed to overlap each other vertically,
• wherein the center roller is mounted on the center roller mounting bracket including a first surface extending toward the vehicle body to be vertical to the door panel, a second surface bent from the first surface toward a lower side of the vehicle body, and a third surface extending from the second surface toward the vehicle body to be vertical to the door panel, and
• wherein the center roller mounting bracket is disposed to be interposed and extend between the lower portion of the upper trim and the upper portion of the lower trim overlapping.