A package structure is provided, which includes: a frame having a cavity penetrating therethrough; a semiconductor chip received in the cavity of the frame, wherein the semiconductor chip has opposite active and inactive surfaces exposed from the cavity of the frame; a dielectric layer formed in the cavity to contact and fix in position the semiconductor chip, wherein a surface of the dielectric layer is flush with a first surface of the frame toward which the active surface of the semiconductor chip faces; and a circuit structure formed on the surface of the dielectric layer flush with the first surface of the frame and electrically connected to the active surface of the semiconductor chip, thereby saving the fabrication cost and reducing the thickness of the package structure.