The invention relates to an electronic unit (2) having a circuit board (7) integrated into an injection moulded circuit carrier (1) and relates to a hearing aid (20) having such an electronic unit (2). In order to reduce the complexity and size of the electronic unit (2) comprising the injection moulded circuit carrier (1) and the circuit board (7), the circuit board (7) is integrated into the injection moulded circuit carrier (1) by introducing the circuit board (7) into the plastic mould (6) such that the surface of one side of the circuit board (7) lies within the plastic mould (6) and the surface of one side of the circuit board (7) is substantially flush with the surface of the plastic mould (6), and by electrically conductively connecting at least one conductive track of the circuit board (16) to at least one conductive track (4) of the injection moulded circuit carrier (1).