The invention provides a workpiece supplier capable of saving space and shortening the workpiece conveying time. The inventive workpiece supplier has a first workpiece support body moving between the change position for changing the workpiece, and the machining position which makes the workpiece at a machining state; a second workpiece support body moving between the change position and the machining position; and a guide unit. The guide unit has a first guide rail guiding the movement of the first workpiece support body and extending in a straight-line shape, and a second guide rail configured in parallel to the first guide rail and guiding to the movement of the second workpiece support body to extend in straight-line shape. The guide unit can make the two workpiece support bodies of each guide rail to perform reciprocating movement to the mutual opposite directions. The guide unit guides each workpiece support body, so that the these workpiece support body can hold the workpiece at the same position at the at least machining position o fhte change position and the machining position.