| 摘要 |
PURPOSE: To secure the excellent working ability in the case of changing over of an operation pattern as simultaneous operation between an operation lever and an operation pattern changing over device, and the mischievous operation of the operation pattern changing over device are prevented. CONSTITUTION: When an operation pattern changing over device 20 for changing over the operation patterns of operation levers 18L, 18R is provided on an upper turning body 4 having an ascending and descending step part 16, the step part 16 is formed of an openable covering body 24. The operation pattern changing over device 20 is arrangedly provided in a space below the covering body 24. |
