Abstract: A miter saw includes a support mechanism for supporting a miter saw unit relative to a base in such a manner that the miter saw unit is both vertically and laterally pivotable. A position determining mechanism serves to selectively determine the position of the saw unit at any of positions including a vertical position where a saw blade is positioned substantially vertically relative to the base, and leftward and rightward pivoted positions where the saw blade is inclined laterally leftwardly and laterally rightwardly from the vertical position by a predetermined angle, respectively. The position determining mechanism includes movable side stopper members and fixed side stopper members on which the movable side stopper members abut, respectively. The movable side stopper members are mounted on a movable member which pivots laterally with the miter saw unit. The fixed side stopper members are mounted on a fixed member which is non-laterally pivotally movably mounted on the base.