A mechanism for sliding relatively in the longitudinal direction the first case and the second case in their superposed state in order to provide a sliding mechanism for mobile terminals that can be produced at a low cost wherein the use of a single sliding module is sufficient, the total length of this sliding module can be shortened to avoid its exposure from the case during use, the locking plate and the sliding cover that constitute the sliding case of the sliding module are not welded but are simply engaged so that the entire construction of the sliding mechanism may be simplified. This sliding mechanism includes a pair of engaging grooves provided on the surface or at specified intervals in the longitudinal direction of both sides of any one of the first case or the second case, a pair of sliding parts provided on any other one of the first case and the second case engaged slidably with these engaging grooves, a sliding module fixed on any one of the first case or the second case, a sliding case comprising a sliding cover and a locking plate wherein this sliding module is mutually superposed and fixed, a slider slidably housed by pressurized contact in this sliding case, a locking means provided between this slider and the sliding case, and a fixing pin fixed on the slider and piercing through a guiding long hole provided on the sliding case and protruding out of the sliding case, wherein this fixing pin is fixed on any other one of the first case or the second case.