A package stacked device may include a first packaging body layer having a first chip embedded therein, and a second packaging body layer positioned under the first packaging body layer and having a second chip embedded therein. The package stacked device may also include a first connection unit protruding from a first bottom surface of the first packaging body layer, a second connection unit protruding from a second top surface of the second packaging body layer, a first covering layer providing a first opening to expose the top surface of the second connection unit and substantially covering the second top surface of the second packaging body layer, and a first adhesive layer substantially covering the exposed top surface of the second connection unit within the first opening. The first connection unit may be inserted into the first opening and connected to the first adhesive layer.