PURPOSE: To restrain a sudden departure of a machine body at the time of restarting work by returning a clutch pedal from the state where work is discontinued by operating the clutch pedal to the clutch disengaging side to the clutch engage side in a farm working vehicle.

CONSTITUTION: When a clutch pedal 6 of a main clutch is operated to the clutch disengaging side, a transmission 18 for traveling and a speed change operating tool are operated to the low speed side, interlocking with the above operation, and even if the clutch pedal 6 is operated to the clutch engage side, the transmission 18 for traveling and the speed change operating tool 20 are held on the low speed side.