Abstract: A workpiece fixing jig for fixing a workpiece to a table and/or a pallet of a machine tool includes a base plate, a support block, a bolt, and a drop prevention unit. The base plate is clamped or unclamped to the table and/or the pallet. The support block is disposed upright on the base plate. The support block has a placement surface for the workpiece on a top surface of the support block. The bolt is housed in the support block to be movable up and down. The bolt is projected from the placement surface to be screwable into a lower surface of the workpiece. The drop prevention unit prevents a drop of the bolt from the inside of the support block.