PURPOSE: To accurately clamp a processed material under pressure in cutting a narrow material.

CONSTITUTION: A lateral guide 23 is arranged in the direction crossing a slit for running a saw at a right angle and a moving roll 24 is arranged to the lateral guide 23 so as to make the sliding of the guide adjustable. The rule piece 26 protruding to a table by revolving operation is provided to the moving roll 24 and a contact rule 28 is provided to the rule piece 26 so as to protrude toward the slit for running the saw. When the revolution of the contact rule 28 is adjusted by a horizontal pivot shaft 28a, the contact rule 28 changes the protruding height of the rule piece 26 to the table. This protruding height is appropriately adjusted according to the thickness of a processed material W.