A mobile soil aerating device including a machine frame, a drive, at least one penetration tool hingedly coupled with the machine frame, said penetration tool being adapted to be driven into the soil and to be pulled out again, said penetration tool being pivotable with respect to the machine frame during a penetration phase in which the penetration tool, prior to penetration, being in an initial position at a predetermined penetration angle, and wherein, at least after having pulled the penetration tool from the ground, at least one element engaging the penetration tool and coupled to the machine frame exerts a restoring moment on the penetration tool in order to pivot the penetration tool back to the initial position.
