A display expansion type mobile terminal with a sliding motion, which is disclosed includes: a flexible display device; a fixed end frame to which the first front end is fixed; a via member provided independently of the fixed end frame; an extension frame which extends from the fixed end frame to a position adjacent to the via member in the predetermined display size adjustment direction A; a movable member which is spaced apart from the via member by an interval corresponding to a length of the extension frame; and a connection member.