A package structure includes a first die, a second die, an encapsulant and at least one electrical contact. The first die has an active surface. The second die is disposed on the first die, and has an active surface and a backside surface opposite to the active surface. The active surface of the second die is closer to the active surface of the first die than the backside surface of the second die is. The encapsulant encapsulates the first die and the second die, and has a top surface far away from the active surface of the first die. The electrical contact is exposed from the top surface of the encapsulant and is configured for connecting at least one conductive wire.