A gantry crane apparatus is disclosed in the present invention. According to an embodiment of the present invention, the gantry crane apparatus comprises: a plurality of support units including a plurality of frame modules which are separately arranged, and facing each other in a direction crossing a separation direction of the frame modules; a plurality of guide units combined with upper portions of the support units to be arranged in the direction crossing the separation direction of the frame modules, and arranged to face each other in the separation direction of the frame modules; trolley units respectively installed on the guide units to be movable; and a hoist unit which is combined with the trolley units and is capable of lifting a target to be moved.
