A surveying device comprising: a base ; a horizontally rotating unit that is connected to the base in a horizontally rotatable state; a TS functional part configured to function as a total station, said TS functional part including a vertically rotating unit fixed to the horizontally rotating unit in a vertically rotatable manner and including a distance measuring unit for measuring a distance between the surveying device and a target by emitting distance measuring laser light to the target, and receiving distance measuring laser light that is reflected by the target; a laser scanner part fixed on top of the horizontally rotating unit and configured to perform laser scanning in a vertical plane containing an optical axis of the emitted distance measuring laser light; a positioning operation section that calculates a position of a target reflective prism of which the distance is measured by the TS functional part using the distance measuring laser light; the surveying device being characterized in that it further comprises: a height calculator that calculates a height of the target reflective prism from a ground surface or a floor surface, on a basis of a three-dimensional coordinate position of the target reflective prism , which is calculated by the positioning operation section , and on a basis of a linear laser scanned point cloud, which is obtained by the laser scanner part in laser scanning along the vertical plane, and which is composed of points on a linear part that extends over said ground or floor surface from a point vertically below the surveying device to a point vertically below the target reflective prism . a base ; a horizontally rotating unit that is connected to the base in a horizontally rotatable state; a TS functional part configured to function as a total station, said TS functional part including a vertically rotating unit fixed to the horizontally rotating unit in a vertically rotatable manner and including a distance measuring unit for measuring a distance between the surveying device and a target by emitting distance measuring laser light to the target, and receiving distance measuring laser light that is reflected by the target; a laser scanner part fixed on top of the horizontally rotating unit and configured to perform laser scanning in a vertical plane containing an optical axis of the emitted distance measuring laser light; a positioning operation section that calculates a position of a target reflective prism of which the distance is measured by the TS functional part using the distance measuring laser light; the surveying device being characterized in that it further comprises: a height calculator that calculates a height of the target reflective prism from a ground surface or a floor surface, on a basis of a three-dimensional coordinate position of the target reflective prism , which is calculated by the positioning operation section , and on a basis of a linear laser scanned point cloud, which is obtained by the laser scanner part in laser scanning along the vertical plane, and which is composed of points on a linear part that extends over said ground or floor surface from a point vertically below the surveying device to a point vertically below the target reflective prism . <EOS>