| 摘要 |
A positioning cylinder 30 is provided for adjusting a bending angle of a second boom 18 with respect to a first boom 12, and a bottom side mounting eye 30A constituting a proximal end side of the positioning cylinder 30 is arranged to be mounted on a first boom connecting pin 17 for connecting a proximal end side of the first boom 12 to a revolving frame 4. In consequence, even when a large load has acted on the first boom 12 due to excavating operation and the first boom 12 has undergone deformation, the bottom side mounting eye 30A of the positioning cylinder 30 can be kept reliably mounted on the first boom connecting pin 17, so that the positioning cylinder 30 can be operated stably over extended periods of time.
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