For the purpose of reducing the detrimental vibration which may cause a labour hazard such as a white finger disease, this paper proposes a new vibration isolation type handle device for hand-operated vibration tools in which a handle member is substantially rigidly connected to a vibration body and which, nevertheless, is capable of effectively isolating detrimental vibration. Moreover, it can be made to have a light weight. The handle device is designed by the principle based on making a vibration node on the handle at the desired frequency range. To demonstrate the effect of vibration isolation by application of the handle device, the experiment using the hand-operated electro motive grinder has been carried out, and then the acceleration transmitted to the handle in the region of 5400 rpm ∼6600 rpm has been reduced under 1/3, especially that at 6000 rpm near zero.