a double sliding - type portable communication apparatus , in which one housing slidably moves relative to the other housing through double - sliding motions , which includes a main housing extending in a longitudinal axis and a sliding housing moving in said longitudinal and also lateral directions across the main housing whose upper surface faces away from the main housing to allow the sliding housing may become displaced away from the main housing and also slidably return to overlap the main housing , wherein said housings are aligned parallel to each other in the longitudinal axis or a lateral direction across the main housing to expose predetermined regions of an upper surface of the main housing with keys provided thereon .