OPENING AND CLOSING STRUCTURE OF SLIDING DOOR FOR VEHICLE

An opening and closing structure of a sliding door for a vehicle includes: a sliding door disposed on a side surface of the vehicle and configured to be slidably open and closed in a longitudinal direction of the vehicle; at least one rail arranged in a longitudinal direction of the vehicle on one of a vehicle body of the vehicle and the sliding door; at least one roller arranged on the other one of the vehicle body and the sliding door, the at least one roller configured to slide while being fitted in the at least one rail; and a sliding unit disposed on a side of the vehicle body or the sliding door on which the at least one roller is arranged, the sliding unit configured to slide the at least one roller in a direction in which the sliding door slides. The at least one roller is configured to slide with respect to the vehicle body and the sliding door.