CRANE SYSTEM

PROBLEM TO BE SOLVED: To improve the working efficiency of the crane by enabling the system to largely reduce the suspension time of the crane working and to resume loading work just after replacement.SOLUTION: The crane system 1A includes traveling sections where a pair of traveling sections that are provided by being spaced out in the width direction of a conveyance path and are travelable in the extension direction of the conveyance path, a crane body that is assembled to a gate type from post sections that extend upwardly from these traveling sections and beam sections that connect upper ends of these post sections in the width direction, a suspension device that is supported by the beam sections and is movable in the width direction, a hoisting accessory 16 that is hung at the suspension device and is elavatory, and a battery unit 2A that is detachably provided in the crane body and supplies power to the traveling sections, the suspension device, and the hoisting accessory 16, wherein an engagement rod 4 that is engageable with the hoisting accessory 16 and the battery unit 2A is elevatably provided in the width direction, and is provided.