Patent ID: 8607558

Claim:
A work machine comprising: a hydraulic pump driven by an engine; a hydraulic actuator driven by pressure oil discharged from the hydraulic pump; a generator motor interfacing with an output system of the engine; a power storage unit for storing electric power when the generator motor is caused to operate as a generator by the engine and for supplying electric power when the generator motor operates as a motor; and an electric actuator driven by the electric power supplied from the generator motor or the power storage unit, wherein the hydraulic actuator and the electric actuator are operated according to operation of an operating lever, and the work machine includes an idling stop control unit having: an operating lever monitoring unit for monitoring an operated state of the operating lever during operation of the engine; a neutral state timing unit for measuring a time for which the operating lever is in a neutral state; an idling stop unit for stopping idling of the engine when the neutral state of the operating lever continues for a predetermined stop time; and a machine operation prohibiting unit for retaining the electric actuator in an operation prohibited state when the idling stop unit stops the idling of the engine.