To enable the locking and unlocking of the rotation of a table by a simple structure.

A lock lever 6 is rotatably mounted behind a base 2 in a state energized to an upper locking position by a stepped screw 22 and a locking angle part 30 of the lock lever 6 is locked with a stopper screw 29 provided to a table 3 at the rotary position of the table 3 in a miter saw to regulate the rotation of the table 3. The hook part 27 of the lock lever 6 is locked with the other stopper screw 28 of the table 3 at the rotary position of the table 3 to regulate the rotation of the table 3. If the lock lever 6 is pushed to a lower unlocking position using an operation piece 26, the locking with the stopper screws 28 and 29 is released at any rotary position of the table 3 to permit the rotation of the table 3.