The present disclosure provides a lane change route instructing device and a lane change route instructing system such that, by considering the necessity of a lane change of a multiple of vehicles existing in a periphery, a coinciding of travel routes accompanying a lane change is avoided, and the vehicles can be caused to carry out a traveling operation smoothly. A lane change route instructing device (1) determines whether or not target travel routes of each vehicle will coincide with each other in accompaniment to a lane change, determines an inter-vehicle priority relating to a lane change, and when it is determined that a coinciding of the target travel routes will occur, transmits a command to maintain the target travel route to a highest priority coinciding vehicle among coinciding vehicles whose target travel routes have been determined to be going to coincide with each other, and transmits a command for evasive travel that avoids a coinciding with the target travel route of the highest priority coinciding vehicle to a low priority coinciding vehicle.
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