To cut a cutting material such as decorative plywood or the like without damaging the same by holding a kickback preventing pawl for preventing the kickback of the cutting material to an upward tilted non-use position.

A slide operation lever 50 is provided along the upper end part of a living knife 5 and, when this lever is subjected to slide operation, the kickback preventing pawl 10 is upwardly tilted to be held to a non-use position and housed between the side surface parts 50b and 50b of the slide operation lever 50.