In order to make it possible to simply monitor the state of operation merely through a response in addition to a normal operation without the need for a diagnostics check, work is performed using a position calculation means for measuring the position of a vehicle body using a satellite positioning system, an autonomously traveling work vehicle (1) that performs work and travels automatically along a set travel route, and an accompanying travel work vehicle (100) that performs work while traveling so as to accompany the autonomous travel work vehicle at a position located a predetermined distance away from the autonomously traveling work vehicle； intercommunication between a remote operation device (112) provided to the accompanying travel work vehicle (100) and a control device (30) on the autonomously traveling work vehicle (1) is enabled through a communication means； and when an operation performed by an operator onboard the accompanying travel work vehicle (100) deviates from a control performed when the autonomously traveling work vehicle travels through a position located a predetermined distance away, the autonomously traveling work vehicle and the accompanying travel work vehicle are stopped from traveling and a warning is issued.
