SLIDING APPARATUS FOR SLIDING DOOR

The present invention relates to a sliding apparatus for a sliding door. The apparatus comprises: a front top roller part including an upper outer bracket and an upper inner bracket which are fitted and fixed to both upper ends of a front door while being connected to each other by an upper connecting bar, and are formed to slide in both lateral directions after moving forward; a front bottom roller part including a lower outer bracket and a lower inner bracket which are fitted and fixed to both lower ends of the front door while being connected to each other by a lower connecting bar, and are formed to slide in both lateral directions after moving forward; a rear roller part including rear outer brackets and rear inner brackets which are formed at both upper ends and both lower ends of a rear door formed on one side of the front door, so as to slide the rear door; a front rail part including guide rails which are formed on the upper and lower end surfaces of a rear door frame and the upper and lower surfaces of the rear inner bracket, such that the upper inner bracket of the front top roller part and the lower inner bracket of the front bottom roller part slide while moving forward along the guide rails; and a straight rail part including straight rails which are formed at the upper and lower ends of a housing, so as to slide the front door and the rear door in both lateral directions.