A circuit board has a grown metal layer in a flexible zone. A circuit board has a first part, a second part and a recess in the circuit board that is arranged between the first part and the second part. A thickness of the circuit board reduced in the region of the recess. The first part can be pivoted relative to the second part as a result of the recess. The flexibility of the circuit board is improved in the range of the recess by a metal layer applied on a surface section of the circuit board in the recess by deposition. Furthermore, EMC problems can be reduced by the metal layer on a side wall of the recess and electrical contacts to conductor path metallization layers can be created.