To prevent a fixing screw from being erroneously too loose to solve such a problem that when a position adjustment is carried out by loosening the fixing screw of a split edge in a table saw including the split edge along a saw blade in order to prevent so-called kickback of a workpiece caused by the rotating saw blade, the fixing screw is too loose and falls out, thus deteriorating work efficiency.

A falling prevention member such as a nut 14 with a loose stopper function is attached to the distal end of the fixing screw 13. This prevents a user from erroneously loosening the fixing screw, thereby preventing it from falling out of a screw hole 11c thereof.