A mobile soil aeration device including a machine frame, a drive, at least one guide arm that can be moved up and down by the drive and that is pivotably arranged on the machine frame, at least one articulated piercing tool that is coupled to the guide arm, said piercing tool can be lowered into the soil and withdrawn therefrom, a tool holder for the piercing tool, that is mounted about a first pivotable axis in the guide arm that can be displaced up and down by the drive in order to allow the piercing tool to pivot in relation to the guide arm when engaging with the soil.
