A sliding apparatus for a dual slide-type portable communication device, which includes a locking unit selectively formed in sliding members and configured to restrict movement of a first sliding member in a direction substantially perpendicular to a lengthwise direction of a body housing when the first sliding member is slid in a lengthwise direction of the body housing and to restrict movement of the first and second sliding members when the first and second sliding members are slid in a direction substantially perpendicular to a lengthwise direction of the body housing. The body housing and a sliding housing configured to be slid on the body housing in a lengthwise direction of the body housing or in a direction substantially perpendicular to the lengthwise direction of the body housing.