A package structure includes a redistribution layer having a first surface, a second surface disposed opposite to the first surface, and at least one sidewall connected to the first surface and the second surface, at least one bonding electrode disposed on the first surface of the redistribution layer, and a mounting layer disposed on the second surface of the redistribution layer. The mounting layer includes a plurality of conductive pads that are spaced apart from each other. At least one of the conductive pads is exposed by the sidewall of the redistribution layer.