To reduce an uncultivated land remaining after automatic travel, by enabling generation of a circling guide path while facilitating generation of a round-travel guide path.SOLUTION: An automatic travel system for a work vehicle comprises: a target-path generation unit 30B that generates a round travel guide path P1 having a reference path Pa adjacent to a first end side A1a of a work side A, a plurality of parallel paths Pb, and a plurality of turning paths Pc and also generates a circling guide path P2 having the reference path Pa and a pair of end paths Pd and interconnected to the round travel guide path P1； a travel control unit 16A that causes a work vehicle 1 to travel along the circling guide path P2 after traveling along the round travel guide path P1； and a work control unit 16B that brings the work vehicle 1 into a non-work travel state in the reference path Pa and the turning paths Pc in the round travel guide path P1 and brings the work vehicle 1 into a work travel state in the reference path Pa and the end paths Pd in the circling guide path P2.SELECTED DRAWING: Figure 3【課題】往復案内経路の生成を容易にしつつ周回案内経路を生成できるようにして自動走行による作業後に残る未耕地を少なくする。【解決手段】作業車両用の自動走行システムは、作業地Ａの第１端辺Ａ１ａに隣接する基準経路Ｐａと、複数の並列経路Ｐｂと、複数の転回経路Ｐｃとを有する往復案内経路Ｐ１を生成し、基準経路Ｐａと、一対の端部経路Ｐｄとを有して往復案内経路Ｐ１に連接される周回案内経路Ｐ２を生成する目標経路生成部３０Ｂと、作業車両１を往復案内経路Ｐ１の走行後に周回案内経路Ｐ２を走行させる走行制御部１６Ａと、往復案内経路Ｐ１での基準経路Ｐａと転回経路Ｐｃでは作業車両１を非作業走行状態とし、並列経路Ｐｂと周回案内経路Ｐ２での基準経路Ｐａと端部経路Ｐｄでは作業車両１を作業走行状態とする作業制御部１６Ｂとを備えている。【選択図】図３
