Working machine

A working machine including left and right side walls erected on a bed, a forward/backward saddle movable in forward/backward directions, left and right sides of the forward/backward saddle being movably supported with the left and right side walls, a forward/backward drive device arranged on the left and right side walls, to move the forward/backward saddle in the forward/backward directions, a left/right saddle arranged on the forward/backward saddle and movable in left/right directions, a left/right drive device arranged on the forward/backward saddle on each of forward/backward sides of the left/right saddle, to move the left/right saddle in the left/right directions, an up/down slider movable up and down and arranged on the left/right saddle, a lower portion of the up/down slider being provided with a processing head to which a processing tool for processing a work set on the bed is removably and replaceably attached, and an up/down drive device arranged on the left-right saddle on each of left and right sides or forward and backward sides of the up/down slider, to move the up/down slider up and down, characterized in that;

• the left/right drive devices arranged on the forward and backward sides of the left/right saddle are at different levels.