To simply cut even a wide material to be cut exceeding a usual cuttable range without taking labor.

The respective guide parts 20 provided to the left and right of a guide fence 8 are constituted so that the guide surface of the front of each of them is formed so as to be up and down divided into the first guide surface 23 formed only to the upper half of each of the guide parts 20 over the total length thereof and the second guide surface 24 retreating from the first guide surface 23 by a predetermined distance to be formed to the lower half of each of the guide parts 20 and parallel to the first guide surface 23. A sub-fence 26 is detachbly inserted in the lower half space 25 of each of the guide parts 20. Therefore, the material to be cut within the usual cuttable range is positioned using the second guide surface 24 of the guide fence 8 and the sub-guide surface 34 of the sub-fence 26 in a state that the sub-fence 26 is mounted and the material to be cut exceeding the usual cuttable range can be positioned by the second guide surface 24 by detaching the sub-fence 26.