HANDHELD WORK MACHINE

To provide a handheld work machine which can contribute to compactification of a grip section of a handle and improve handleability of the work machine by optimizing the arrangement of a lock member, an output operation member, and a position sensor in the grip section.SOLUTION: A handheld work machine includes: a prime mover 5 to be a power source; a handle 9 which has a grip section 10 extending in a longitudinal direction; an output operation member 11 which is arranged on a lower face of the grip section 10 and is vertically oscillated and operated; a lock member 13 which is arranged on a top face of the grip section 10 so as to lock the output operation member 11 at a non-operation position; and a position sensor 29 which detects the position of the output operation member 11 and contributes to control of the prime mover 5. The arrangement position of the position sensor 29 is in the grip section 10, and is at a rear position of the output operation member 11, at a lower position of the lock member 13, and on a front side of a line 310 connecting a lower end 11h of the output operation member 11 and a rear end 13f of the lock member 13.SELECTED DRAWING: Figure 4 【課題】ハンドルのグリップ部におけるロック部材と出力操作部材と位置センサとの配置を適正化することにより、前記グリップ部のコンパクト化に貢献でき、且つ、作業機の取扱性も向上させ得る、手持式作業機を提供する。【解決手段】動力源となる原動機５と、前後方向に延びるグリップ部１０を有するハンドル９と、前記グリップ部１０の下面に配設されて上下に揺動操作される出力操作部材１１と、該出力操作部材１１を非操作位置にロックするために前記グリップ部１０の上面に配設されるロック部材１３と、前記出力操作部材１１の位置を検知して前記原動機５の制御に寄与する位置センサ２９と、を備え、該位置センサ２９の配設位置が、前記グリップ部１０の内部であって、前記出力操作部材１１の後方位置且つ前記ロック部材１３の下方位置且つ前記出力操作部材１１の下端１１ｈと前記ロック部材１３の後端１３ｆとを結ぶ線３１０より前側とされる。【選択図】 図４