A survey data processing device comprising: a point cloud data receiving unit that receives first point cloud data and second point cloud data, the first point cloud data being obtained by a first laser scanner, wherein the first laser scanner is placed so as to be horizontal at a first instrument point, the second point cloud data being obtained by the first laser scanner or a second laser scanner, wherein the first laser scanner or the second laser scanner is placed so as to be horizontal at a second instrument point, the second laser scanner being different from the first laser scanner; a horizontally cut section generating unit that cuts the first point cloud data and the second point cloud data at a horizontal plane to obtain a horizontally cut section of each of the first point cloud data and the second point cloud data; a horizontal position adjusting unit that matches horizontal positions of the horizontally cut sections of the first point cloud data and the second point cloud data as viewed from a vertical direction; an instrument point obtaining unit that obtains positions of the first instrument point and the second instrument point of the first point cloud data and the second point cloud data as viewed downwardly from the vertical direction, on a basis of the first point cloud data and the second point cloud data of which the horizontal positions are matched by the horizontal position matching unit; a vertically cut section generating unit that cuts the first point cloud data and the second point cloud data at a vertical plane containing the first instrument point and the second instrument point to obtain a vertically cut section of each of the first point cloud data and the second point cloud data; and a vertical position adjusting unit that matches vertical positions of the vertically cut sections of the first point cloud data and the second point cloud data as viewed from a direction perpendicular to the vertical plane. a point cloud data receiving unit that receives first point cloud data and second point cloud data, the first point cloud data being obtained by a first laser scanner, wherein the first laser scanner is placed so as to be horizontal at a first instrument point, the second point cloud data being obtained by the first laser scanner or a second laser scanner, wherein the first laser scanner or the second laser scanner is placed so as to be horizontal at a second instrument point, the second laser scanner being different from the first laser scanner; a horizontally cut section generating unit that cuts the first point cloud data and the second point cloud data at a horizontal plane to obtain a horizontally cut section of each of the first point cloud data and the second point cloud data; a horizontal position adjusting unit that matches horizontal positions of the horizontally cut sections of the first point cloud data and the second point cloud data as viewed from a vertical direction; an instrument point obtaining unit that obtains positions of the first instrument point and the second instrument point of the first point cloud data and the second point cloud data as viewed downwardly from the vertical direction, on a basis of the first point cloud data and the second point cloud data of which the horizontal positions are matched by the horizontal position matching unit; a vertically cut section generating unit that cuts the first point cloud data and the second point cloud data at a vertical plane containing the first instrument point and the second instrument point to obtain a vertically cut section of each of the first point cloud data and the second point cloud data; and a vertical position adjusting unit that matches vertical positions of the vertically cut sections of the first point cloud data and the second point cloud data as viewed from a direction perpendicular to the vertical plane.