| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a boom allowing a worker to visually check directly from a side of a boom body that a base end side engaging body reaches a scoop start point, and thereby allowing the worker to appropriately guide an operator for scooping motion.SOLUTION: On outside faces of a main boom body 14 and a first extension boom body 15 in a right-left direction, a hook side mark 19 and a pin side mark 22 for guiding a hook 18a to a scoop start point are formed so that visual check is allowed from a side position of a boom 5.</p> |
