To assure the sufficient livability of an operator in a driver's seat while averting the simultaneously erroneous manipulation of crushing and traveling.
The driver's seat 42 is disposed on the front side and left side of a power unit 32 and tanks 34 and 35 are disposed on the front side and right side of the power unit 32. A control valve device 100 is arranged between the driver's seat 42 and the tanks 34 and 35. Spools of respective control valves are arrayed in one row in a longitudinal direction while an axial direction is held in a vertical direction. The driver's seat 42 is provided with manipulation levers 52 and 53 to be manually manipulated by the operator. A control panel 55 has a switch which forms and outputs a drive current signal to a solenoid control valves of the control valves.
NASU KATSUYOSHI
WATANABE MITSUO
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