A printed circuit board includes a substrate portion including a first insulating layer, a first wiring layer disposed on or within the first insulating layer, and a cavity penetrating through at least a portion of the first insulating layer; a connection structure disposed within the cavity of the substrate portion, and including a second insulating layer, a second wiring layer disposed on or within the second insulating layer, and a metal layer disposed on a lower surface and a side surface of the second insulating layer, wherein the metal layer is disposed on an outermost side of the connection structure.