Dispersion work vehicle

Provided is a spreading work vehicle capable of spreading a sufficient amount of a chemical by expanding and contracting a side lance so as to overlap the spreading range of the chemical in an adjacent row. The present invention is provided with a liquid dispersing device (10) for dispersing a liquid, the liquid dispersing device is provided with a plurality of dispersing nozzles (130) at predetermined intervals, the liquid dispersing device can be moved, a position information acquisition means (140) for acquiring position information of a dispersing work vehicle (1) is provided, an expansion/contraction amount detection means (108) for detecting the expansion/contraction amount of the liquid dispersing device is provided, and the position information acquisition means (140) acquires the position information of the dispersing work vehicle (1) and the expansion/contraction amount detection means (108) are provided. The position information acquired by the position information acquisition means and the amount