This board loading/unloading device 1 comprises: an accommodation rack 2; a processing pallet 10 having skids 15; a traverser 30 that loads and unloads the processing pallet 10 onto and from a lifter 20; and a plurality of cleansing members 54 that come into contact with side surfaces 15b of the skids 15 and removes adhering matter 17 when the processing pallet 10 is withdrawn from a processing pallet accommodation part 6 by the traverser 30, or when the processing pallet 10 is sent out to the processing pallet accommodation part 6. Each of the plurality of cleansing members 54 is composed of a first cleaning blade 54.