A work machine that can prevent restarting of an engine against a will of an operator from an idle stop state is provided. A hydraulic excavator includes a display device that displays a confirmation screen image for allowing an operator to confirm whether or not an engine is to be restarted from an idle stop state, and an inputting device that allows the operator to input a restart instruction for the engine in an interlocked relationship with the display of the confirmation screen image. A machine controller includes a restart controlling section that restarts the engine based on the restart instruction for the engine inputted by the inputting device.