To provide a sheet material processing machine in which the errors due to the deviation of the sheet material during turning of the sheet material by a workpiece holder can be reduced and processing accuracy can be improved.

The sheet material processing machine 1 includes a machining head 3 and a sheet material positioning device 4 which has a workpiece holder 9 gripping the end of the sheet material W and positions the sheet material W with respect to the machining head 3. The machine has a first sheet material fixing device 15 for fixing the sheet material W by pressing the sheet material onto a table 3. The sheet material processing machine 1 is provided with a second sheet material fixing device 16 for fixing the sheet material W by pinching both ends thereof by a pair of sheet material pinching members 16a.