Disclosed is a slide type portable terminal which includes a clean back cover covering a back surface of a sliding housing during the sliding of the sliding housing. The cover prevents the back surface from being exposed. The terminal further has a double sliding assembly structure to improve the assembly strength in sliding. The slide type portable terminal including a body housing and a sliding housing sliding relative to the body housing while facing the body housing includes a guide plate formed in the body housing to double guide a sliding of the sliding housing, and a double sliding plate formed in the sliding housing to be double assembled with the guide plate and engaged with the guide plate to slide.