PROBLEM TO BE SOLVED: To provide an automatic traveling work vehicle capable of performing automatic steering traveling with high accuracy even during the work traveling along a set target travel route.SOLUTION: An automatic traveling work vehicle comprises: a first control computation part which outputs a first steering value for canceling a deviation on the basis of a positional deviation between a target travel route and the own vehicle; a second control computation part which outputs a second steering value for canceling a deviation on the basis of the positional deviation and an azimuth deviation adjusted by using a weighting coefficient indicating a decrease tendency as the positional deviation increases; a target steering computation part which outputs the target steering value for traveling along the target travel route on the basis of the first steering value and the second steering value; a steering drive control part which outputs a steering drive signal with the target steering value as input; and
