PROBLEM TO BE SOLVED: To improve increase in size and weight of truck frames formed by casting molding so as to increase adaptability to a small-sized vehicle.SOLUTION: A semi crawler-type work vehicle, in which driving sprockets 10L and 10R are mounted on driving shafts 9L and 9R at both sides of a travelling vehicle, front-side disposed wheels 11L and 11R, rear-side disposed wheels 12L and 12R and a plurality of rotatable wheels 13L, 13L and 13R, 13R are provided in truck frames 17L and 17R which can freely oscillate around a lateral shaft, is provided with crawler travelling devices 3L and 3R wound with rubber crawlers, where a sub frame 24, which is made of a sheet metal material and supports a front-side disposed wheel 11, is connected to a front side of a truck frame 17 and the rotatable wheels 13 and 13 are fitted to the sub frame 24 and the truck frame 17. Further the rotatable wheels 13 and 13 are fitted to a lower frame 17c of the truck frame 17, and the sub frame 24 is provided with a horizontal base 24b flush with a lower surface of the lower frame 17c, where the rotatable wheels 13 and 13 are mounted on the horizontal base 24b.SELECTED DRAWING: Figure 10
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