PURPOSE: To enable a workpiece to be taken out, even when an obstacle is present on the workpiece, by constituting a device enabling a pressing arm to be displaced to a retracting position from a clamping pawl and to an advancing position pressing the workpiece and displacing the pressing arm from the retracting position to the advancing position while the clamping pawl moves clamping the workpiece.

CONSTITUTION: When a clamping pawl 8a clamps a workpiece 11 on a work bed 10, a pressing arm 24 is placed in a retracting position from the clamping pawl 8a. While the clamping pawl 8a is in movement clamping the workpiece 11 to a position engaging with a chucking device 13 of a machine tool 12, the pressing arm 24 changes to an advancing position. And pressing the workpiece 11 by an elastic member, when the clamping pawl 8a is released from its clamping, the workpieces is extruded by force of the elastic member. Thus because taking out work is performed only by the clamping pawl 8a when the workpiece 11 is taken out, even when an obstacle 21 is provided existing, the workpiece 11 can be taken out by the clamping pawl 8a.