A package structure including a wiring substrate, semiconductor dies, and a dielectric layer is provided. The wiring substrate includes die bonding regions and guiding patterns (auxiliary patterns, or dummy patterns) distributed between the die bonding regions. The semiconductor dies are disposed on the die bonding regions and electrically connected to the wiring substrate, wherein the guiding patterns are electrically insulated from the semiconductor dies. The dielectric layer is disposed the semiconductor dies and the wiring substrate, wherein the dielectric layer covers and is in contact with the guiding patterns.