Disclosed is a sliding module for a sliding-type portable terminal having a pair of sliding rail modules adapted to slide the sliding housing of the terminal along a curved path. The sliding module includes a main housing extending along a longitudinal direction, a sliding housing adapted to slide along a curve in the longitudinal direction toward or away from the main housing, and a pair of sliding rail modules positioned on both sides of the housings to couple the sliding housing to the main housing in such a manner that the sliding housing can slide from the main housing along a curve in the longitudinal direction and to expose and hide predetermined regions of the upper surfaces of the housings.