Abstract: A mobile soil working device, comprising a machine frame, a drive for at least one piercing tool, a guiding element, moveably guided on the machine frame, for at least one piercing tool, a tool holder for the piercing tool, which holder is mounted around a first pivot axis in the guiding element is provided. It is provided that the overall center of gravity of the tool holder and the at least one piercing tool is arranged in relation to the first pivot axis in such a way that the moment of inertia of the tool holder and the piercing tool that counteracts the restoring moment is at least partially reduced or compensated or overcompensated in such a way that the moment of inertia acting around the first pivot axis forms at least part of the restoring moment.