An apparatus for non-invasive subsoil inspection used for verifying the presence of any underground facilities includes a mobile support structure (2) which can be moved in at least one horizontal direction and which supports antennas (A) adapted to transmit an electromagnetic signal towards the soil and to receive the response echoes. An electronic processing unit is adapted to analyze the data acquired by the antennas and to reconstruct an image of the subsoil portion scanned by the machine.