| 摘要 |
PROBLEM TO BE SOLVED: To prevent an operating space from being damaged by a post member used as a sun shade strut or a roll-over protective structure, and to prevent a radius of revolution of a revolving structure from being increased by the existence of the post member. SOLUTION: A revolving structure 4 is provided to freely revolve round the vertical axis P1 on a traveling gear 1, the revolving locus X drawn by the rear part of the revolving structure 4 substantially falls in the lateral width of the traveling gear 3, the width between the right and left side surfaces 4A of the revolving structure 4 is formed to be smaller than the diameter of the revolving locus X, and post members 41 are erected on the right and left side surfaces 4A of the revolving structure 4.
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