Abstract: There is described a device for the detection of objects lying in the earth which, irrespective of topography, soil structure and state of the terrain, permits high surface yields with great precision in identifying the position of the objects to be detected without endangering the operating personnel. On a mobile device (10) is arranged at least one jib (20) swivellable about a vertical axis, on whose free end are arranged adjacent to each other several measuring heads (40) for sweeping over strip-shaped surface areas (2a-d) of the terrain to be investigated. With the measuring heads (40) on the free end of the jib (20) at least one ground marking device (60) is arranged for distinguishing the find site determined by the measuring heads (40). The ground marking device (60) includes a paint spraying device (61) as well as a stake marking device (66) next to each measuring head (40).