A stacked semiconductor package includes a first semiconductor package having a first semiconductor chip having a first pad and a through-hole passing through a the portion corresponding to the pad; a second semiconductor package disposed over the first semiconductor package, and including a second semiconductor chip having a second pad disposed at a portion corresponding to the first pad and blocking the through-hole; and a through-electrode disposed within the through-hole, and having a pillar shaped core supported by the second pad, a through-electrode unit disposed over a surface of the core and electrically connected with the second pad, a first metal layer interposed between the core and the through electrode unit, and a second metal layer interposed between an inner surface of the first semiconductor chip formed by the through-hole and the through-electrode unit.