PROBLEM TO BE SOLVED: To provide a technique contributing to improvement of operability in a power working machine.SOLUTION: This power working machine 101 is such that a handle 107 turnably attached to a machine body 103 is provided with a handle fixing member 125 which fixes the handle 107 to the machine body 103 or releases its fixation, an output adjusting member 131 which adjusts the output of a driving-motor 111, and a fixation release operating member 141 which fixes the output adjusting member 131 to an initial position. The fixation release operating member 141 and the handle fixing member 125 are associated with each other so that the handle 107 is fixed to the machine body 103 with the handle fixing member 125 when the fixation release operating member 141 is operated to a position for releasing fixation of the output adjusting member 131, and fixation of the handle 107 with the handle fixing member 125 is released when the fixation release operating member 141 is operated to a position for fixing the output adjusting member 131.COPYRIGHT: (C)2010,JPO&INPIT【課題】 動力作業機において、操作性の向上に資する技術を提供する。【解決手段】 動力作業機101において、機体103に回動自在に取付けられたハンドル107に、当該ハンドル107を機体103に固定または当該固定を解除するハンドル固定部材125と、原動機111の出力を調整する出力調整部材131と、出力調整部材131を初期位置に固定する固定解除操作部材141を設ける。固定解除操作部材141が出力調整部材131の固定を解除する位置へと操作されたときに、ハンドル固定部材125によってハンドル107が機体103に固定され、固定解除操作部材141が出力調整部材131を固定する位置に操作されたときには、ハンドル固定部材125によるハンドル107の固定が解除されるように、固定解除操作部材141とハンドル固定部材124とを連動した。【選択図】 図2