SLIDING DOOR DEVICE FOR VEHICLE

A sliding door device for a vehicle, includes: a door that opens or closes a door opening formed in a vehicle body; a door arm provided with a first end portion rotatably connected to the door and a second end portion movable along a side sill of the vehicle body; a first slider pivotally coupled to the second end portion of the door arm so that the door arm rotates; a second slider coupled to the first slider to provide a path in which the first slider moves and to linearly move along the side sill; and a lower arm pinion gear which is rotatably coupled to the second end portion of the door arm and gear-engaged with the second slider to provide rotation force to the door arm so that the door arm rotates when the first slider moves in a longitudinal direction of the second slider.