OPERATION PART STRUCTURE OF WORK MACHINE

摘要

PROBLEM TO BE SOLVED: To provide an operation part structure having a control tower capable of reducing weight and a cost without deteriorating strength and the function and allowing the setting of a complicated shape. SOLUTION: The control tower 4 erected and arranged on a floor step 3 is constituted as a hollow body having a flat cross-sectional shape by blow molding, and when arranging a rib R recessed and projected in the flat direction (the longitudinal direction) on a rear surface 4B among a front face and the rear surface 4B being vertically turning surfaces opposed in the flat direction of the control tower 4, a first rib part r1 extending in the rightward upward inclining direction and a second rib part r2 extending in the leftward upward inclining direction are arranged in a state of presenting an almost X shape on an intersection of mutual these both rib parts r1 and r2.