| 摘要 |
PROBLEM TO BE SOLVED: To prevent damage by interfering an offset angle sensor with an obstacle. SOLUTION: An offset boom connecting bracket part 32 and an offset stay mounting bracket part 38 are provided on a tip end part of a base boom 7. An offset angle sensor 50 is mounted on an upper surface of the offset stay mounting bracket part 38. An offset angle sensor protecting means 60 is protruded from an upper surface of the offset boom connecting bracket part so as to rise more than the offset angle sensor 50. Thus, the offset angle sensor protecting means 60 interferes with an obstacle, and the offset angle sensor 50 is prevented from interfering.
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