A riding work vehicle that includes a running electric motor unit running and driving a driving wheel unit a speed setting operation unit operated by a driver to set a target running speed a working electric motor driving a work device that performs work on a worked object around a vehicle body corresponding to running of the vehicle body and an exceptional speed controller that performs exceptional speed control to control the running electric motor unit at an exceptional speed lower than the target running speed in a case where load of the working electric motor evaluated by a work load evaluator that evaluates load of the working electric motor is abnormal load higher than a threshold value.