PROBLEM TO BE SOLVED: To provide a power working machine and a backpack type power working machine equipped with a vibration damping device capable of preventing close contact between lines of a compression coil spring and exhibiting excellent vibration damping performance. A compression coil spring (15) interposed between a drive source (8) and a mounting portion (5) is provided on the drive source (8) side or one side of the mounting portion (5) inside the compression coil spring (15) before the compression lines closely contact each other. Since the arranged rubber material 19 abuts on the drive source 8 side or the other side of the mounting portion 5, close contact between the compression coil springs 15 is prevented, and the excellent vibration damping performance of the compression coil springs 15 is brought out, and at the same time the drive is performed. The impact caused when the source 8 side or the other side of the mounting portion 5 contacts the rubber material 19 is absorbed by the rubber material 19, and as a result, excellent vibration damping performance can be exhibited. [Selection diagram] Figure 2【課題】圧縮コイルバネの線間密着を防止し、優れた防振性能を発揮できる防振装置を備えた動力作業機及び背負式動力作業機を提供する。【解決手段】駆動源８と搭載部５との間に介在する圧縮コイルバネ１５が縮み線間密着する前に、駆動源８側又は搭載部５の一方側に設けられて圧縮コイルバネ１５の内側に配置されたゴム材１９が、駆動源８側又は搭載部５の他方側に当接するため、圧縮コイルバネ１５の線間密着が防止され、圧縮コイルバネ１５の優れた防振性能が引き出されると共に、駆動源８側又は搭載部５の他方側がゴム材１９に対して当接する際の衝撃はゴム材１９により吸収され、その結果、優れた防振性能を発揮できる。【選択図】図２
