To suppress vibration of pilot valves, other than a traveling pilot valve used in traveling and reduce the operation force except for when traveling.

A hydraulic circuit includes a shuttle valve 32, positioned between first pilot pipes 14 and 15 variable throttle valves 33, 34 operated by pilot oil, where the pilot oil is sent front traveling pilot valve 8 via the shuttle valve 32 are provide in second pilot pipes 16 and 17 respectively. The first pilot pipes 14, 15 feed a pilot oil front the traveling pilot valve 8 to the first control valve 10, and the second pilot pipes 16, 17 feed the pilot oil from other pilot valve 9 to the second control valve 11. Thus, when the traveling pilot valve 8 is operated, traveling motor 12 revolves according to the action of the control valve 10, as well as pilot oil from the traveling pilot valve 8 is sent to variable throttle valves 33, 34 via the shuttle valve 32. Because the path of the pilot oil introduced to the second pilot pipes 16 and 17 is restricted, the back pressure of the pilot valve 9 is enhanced, and then the operation force of the lever becomes high.