A substrate structure and a semiconductor package structure including the same are provided. The substrate structure includes a circuit layer and a dielectric structure. The circuit layer has a bottom surface and a top surface opposite to the bottom surface. The dielectric structure around the circuit layer. The dielectric structure covers a first part of the bottom surface of the circuit layer, and exposes a second part of the bottom surface and the top surface of the circuit layer. The dielectric structure exposes the top surface of the circuit layer. In addition, a method of manufacturing a semiconductor package structure is also provided.