| 摘要 |
A sub-boom device (70) includes a sub-boom support member (79) having a working sub-boom support member (72) and a containment sub-boom support member (73). The sub-boom member (74) is separated from the working sub-boom support member (72), and is installed at the containment sub-boom support member (73). The sub-boom member (74) is housed at a containment position adjacent to the side of the work stand (40) by tilting the sub-boom support member (79) in a downward direction. |
