To easily and certainly guide a chain from the neighbourhood of a sprocket by guiding the side of an opening part of the chain downward through a rod type guide member to make contact with the inside of the chain in a chain entrainment prevention device.

A sprocket is fixed on a rotation axis of a chain winding motor, a driving chain is wound around this sprocket and a sprocket of a drive shaft 21, and one side of a chain 35 for suspension is wound around the sprocket 25 of the drive shaft 21, etc. This chain 35 is fixed on an upper end of a pillar 19 through the other side sprocket after led to a bottom surface of a lower stage pallet through a sprocket of one side of a lower stage pallet and passing it. At this time, though the chain wound up trails in a U shape and tends to make a loose part, as the side of an opening part of the chain 35 is guided downward by rod type guide members 63, 65 making contact with the chain 35, it is possible to certainly prevent entrainment of the chain 35 to the sprocket.