Abstract: A workpiece fixing method capable of machining a workpiece with high accuracy by firmly fixing the workpiece with no necessity of using a special freezing chuck device is provided. For this purpose, a macromolecular freezing agent having the freezing point hither than that of water and represented by silicone oil is interposed at least between the workpiece and the surface of a fixing jig under which a fluid at a temperature lower than the freezing temperature of the macromolecular freezing agent is operated on the fixing jig during a time period of machining the workpiece whereby the macromolecular freezing agent is cooled and frozen and the workpiece is adhered and fixed.