This slide device comprises a first tension member connected to a distal end of an opening cable, a second tension member connected to a distal end of a closing cable, a lower roller bracket rotatable mounted on a sliding door, a first pin disposed at a front portion of a lower roller bracket, and a second pin disposed at a rear portion of the lower roller bracket. The front of the first tension member is rotatably connected to the first pin and the rear of the second tension member is rotatably connected to the second pin. The first tension member and the second tension member overlap with each other.