PURPOSE: To provide an autonomous travel working vehicle capable of autonomously traveling along the boundary between a worked land and an unworked land, having economic efficiency and not contaminating the worked land.

CONSTITUTION: This autonomous travel working vehicle photographs the boundary part between a worked land C and an unworked land B by a CCD camera 26 with advance of a vehicle, detects a position of each ball 40 placed along a boundary L between the worked land and the unworked land in the previous working lane traveling in a photographed image picture, recognizes deviation of a body from a target position by comparing a line connecting these positions with a preset target line and autonomously travels by controlling a steering mechanism based on the recognized data. In the autonomous travel, balls 40 are newly placed on the boundary between the worked land and the unworked land at the opposite side of the advance direction of the vehicle by a ball placing device 11a (11b) to provide the next operating lane travel and the balls 40 placed on the worked land during the previous operating lane travel are recovered by a ball recovering device 20a (20b) and supplied through a ball feed pipe 25 to the ball placing device.