PROBLEM TO BE SOLVED: To provide a side-by-side travel work system in which, when both of a manned work vehicle and an unmanned work vehicle travel side by side and work, and a control amount of one working machine is changed to each other through communication means, the other working machine can change to become a control amount in conformity to the control amount.SOLUTION: A control device 130 of a manned adjoint traveling work vehicle 100 and a working machine controller 310 of a fertilizer drill 300, and a control device 30 of an autonomous traveling work vehicle 1 and a working machine controller 270 of a fertilizer drill 250, are connected through communication lines 305, 261, respectively. Also, the control device 30 and the control device 130, and a remote control device 112, are made communicable by communication means. Feeding motors 257, 258 of the autonomous travel working vehicle 1 are controlled in accordance with control of feeding motors 301, 302 of the adjoint traveling work vehicle 100.【課題】有人の作業車両と無人作業車両が併走して作業を行うときに、互いに通信装置を介して、一方の作業機の制御量を変更すると、他方の作業機はその制御量に合わせた制御量となるように変更できる併走作業システムを提供しようとする。【解決手段】有人の随伴走行作業車両１００の制御装置１３０と施肥播種機３００の作業機コントローラ３１０、及び、自律走行作業車両１の制御装置３０と施肥播種機２５０の作業機コントローラ２７０と、をそれぞれ通信ライン３０５・２６１を介して接続するとともに、前記制御装置３０と制御装置１３０及び遠隔操作装置１１２とを通信装置により通信可能とし、随伴走行作業車両１００の繰出モータ３０１・３０２の制御に伴い自律走行作業車両１の繰出モータ２５７・２５８を制御する。【選択図】図２
