A manufacturing method of a circuit board including the following steps is provided. A carrier substrate is provided. A patterned photoresist layer is formed on the carrier substrate. An adhesive layer is formed on the top surface of the patterned photoresist layer. A dielectric substrate is provided. A circuit pattern and a dielectric layer covering the circuit pattern are formed on the dielectric substrate, wherein the dielectric layer has an opening exposing a portion of the circuit pattern. The adhesive layer is adhered to the dielectric layer in a direction that the adhesive layer faces of the dielectric layer. The carrier substrate is removed. A patterned metal layer is formed on a region exposed by the patterned photoresist layer. The patterned photoresist layer is removed. The adhesive layer is removed.