To provide a reciprocating work machine capable of reducing power consumption.SOLUTION: A control section of a reciprocating work machine has an energy saving mode. In the energy saving mode, a voltage of a first effective value is applied to a motor in a first period during one reciprocating operation of an upper blade 7 and a lower blade 8, and a voltage of a second effective value lower than the first effective value is applied to the motor in a second period during the one reciprocating operation of the upper blade 7 and the lower blade 8. The first period includes a work period in which an opposite material is held and cut by a blade section 7b of the upper blade 7 and a blade section 8b of the lower blade 8. The second period is at least a part of a non-work period in which the blade section 7b of the upper blade 7 and the blade section 8b of the lower blade 8 overlap with each other and an opposite material held by the blade sections 7b and 8b does not exist. The second period is determined not to overlap with the work period.SELECTED DRAWING: Figure 3【課題】消費電力を低減可能な往復動作業機を提供する。【解決手段】往復動作業機の制御部は、省エネモードを有し、省エネモードでは、上刃７及び下刃８の一往復動作中における第１期間は、第１実効値の電圧をモータに印加し、上刃７及び下刃８の一往復動作中における第２期間は、前記第１実効値よりも低い第２実効値の電圧を前記モータに印加する。第１期間は、上刃７の刃部７ｂと下刃８の刃部８ｂとで相手材を挟み込んで切断している作業期間を包含する。第２期間は、上刃７の刃部７ｂと下刃８の刃部８ｂとが互いに重なっていて刃部７ｂ、８ｂに挟まれる相手材が存在しない非作業期間の少なくとも一部である。第２期間は、作業期間と重複しないように決定される。【選択図】図３
