The present invention relates to a ground construction device capable of a driving work of driving a pile into the ground and a boring work of excavating a bored hole by replacing a working device such as a boring machine and a driving machine. Specifically, a horizontal bar is horizontally installed in front of a crane main body of a crane, and multiple strands of wire ropes are installed between an upper support installed in the upper part of a boom and the horizontal bar. An ascending and descending unit on which the working device such as the boring machine or the driving machine is mounted is installed in the wire rope to be guided to ascend and descend. So, when the wire rope is expanded as the boom is erect, the expanded wire rope substitutes for a role of an existing pillar (leader). According to the present invention, The ground construction device is installed in the crane (1). A lower end of the boom (3) is installed on front of the crane main body (2) by a hinge. An upper support (5) including an upper roller (6) is installed in the upper part of the boom (3), and the upper roller (6) hangs down a winch wire (4) as the winch wire (4) is wound thereon by a winch device. A hook (4a) is installed at an end of the winch wire (4) hung down by being wound on the upper roller (6).
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