metals by the loading and unloading unit 1 for sheet metals relating to the present invention will be explained below with reference to fig1 to 4 and fig9 to 15 at first prior to the loading and unloading and working of a sheet metal w the brush table 50 is moved back moved upwards in fig2 to make empty a working space 99 at a front side a lower side in fig2 of the loading and unloading unit 1 for sheet metals in this working space 99 a pallet 101 for a sheet metal to be worked loaded with the sheet metal w is mounted on the lifter 97 this lifter 97 is moved to a lower side of the sheet taking up unit 33 along the guide rail 95 and the pallet 101 for sheet metal to be worked is lifted by the lifter 97 in the state that the pallet supporting bracket 87 for sheet metal to be worked is stored the pallet 101 is lifted to a position higher than the pallet supporting bracket 87 or 89 for sheet metal to be worked and the lifter 97 is lowered after the pallet supporting bracket 87 or 89 for sheet metal to be worked is taken out then the pallet 101 for sheet metal to be worked is set on the pallet supporting bracket 87 or 89 for sheet metal to be worked further the lifter 97 is advanced to the front side to a lower side in fig2 and the pallet 103 for worked sheet metal is mounted on the lifter.