Abstract: A fixing jig is made up of a plate-like jig main body (2) and a close contact layer (3) which detachably holds a work (W) in close contact therewith. The jig main body has: on one surface thereof a plurality of supporting projections (4) to support the close contact layer; and also has, along an outer peripheral portion of said one surface, a side wall (5) which is of substantially the same height as the supporting projections. The close contact layer is adhered to an end surface of the side wall to thereby define a partitioned space (6) between the close contact layer and the jig main body. By sucking the air within the partitioned space via a ventilation hole (7) formed in the jig main body, the close contact layer is deformed. The work is thus surely supported and fixed also in performing a processing in which a force is applied to the work.