Vibration damping device of Kiyabin in construction machinery

(57) [summary] [purpose] to improve the ride comfort by suppressing the vibration of the cabin at the time of excavation work. [Configuration] cabin 2 is elastically supported on a construction machine body, and, in the construction machine head guard 4 is attached to the upper portion of the cabin 2, isolator 5 head guard 4, which includes a viscosity and elasticity attached to the cabin upper surface via, by this isolator 5 and the head guard 4, it constitutes a dynamic damper having a damping effect on the vibrations of at least the lateral direction of the cabin 2.