Abstract: The present invention relates to a riveting apparatus having a power supply unit (20), which is replaceable or exchangeable, attached to the riveting apparatus, said power supply unit having a preferably rechargeable battery and the riveting apparatus being adapted to be brought into an operative condition by attaching the power supply unit at the riveting apparatus, and comprising a rivet pin collecting compartment (12) comprising at least one closeable discharge opening (13). In order to ensure that the riveting apparatus is operated at closed rivet pin collecting compartment only, it is provided according to the invention that in the operative condition of the riveting apparatus the power supply unit forms a cover that closes the discharge opening.