PROBLEM TO BE SOLVED: To realize a compact underlift structure by using a plurality of drive cylinders, and to provide an underlift structure having a thin tow arm into which an in-vehicle portion at the tip of the arm can be inserted even in a towed vehicle having a low floor. .. SOLUTION: In the underlift structure of the present invention, as the traction arm 30 is designed in a thin and wide form, the width of the vertical frame 20 is made wide by substantially matching the width of the traction arm, and the upper end of the vertical frame is left and right. A pair of actuating auxiliary frames 22 and 22 are provided on the side surfaces so as to project upward toward the front of the loading platform frame at intervals from the vertical frame, and the upper end of the drive cylinder 40 is provided at the projecting tip of each pair of left and right actuating auxiliary frames. Are connected to form a plurality of cylinder drive types, and the drive cylinders are arranged so as to hang down at a right angle or a substantially perpendicular angle to the operation auxiliary frame protruding slightly upward, and the driving force of the drive cylinders is applied. The structure is such that it is attached to the traction arm via the operation auxiliary frame and lifted. [Selection diagram] Fig. 3
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