Construction machine

A construction machine comprising:

• a key switch for switching a state of power supply to an engine controller for controlling an engine;
• an engine start switch for sending a command to start the engine to the engine controller, and an engine stop switch for sending a command to stop the engine to the engine controller;
• a notification device;
• a controller which operates on electric power supplied from a battery, receives signals outputted from the key switch, the engine start switch, and the engine stop switch, and is connected to the notification device;
• and
• a battery shutoff switch for shutting off the power supply from the battery to the engine controller, the notification device, and the controller,
• wherein in a case where the key switch is turned on, the key switch starts the controller by starting the power supply thereto, and
• in a case where the key switch is turned off, the key switch shuts down the controller by stopping the power supply thereto,
• the controller includes a history storage section which receives the signal outputted by operating the key switch, the engine start switch or the engine stop switch, and chronologically stores operation histories of the individual on-state switches in the history storage section in a non-volatile manner while the controller is running,
• in a case where the controller is restarted by resuming the battery shutoff switch from a state of shutting off the power supply from the battery and turning on the key switch, the controller determines, on the basis of the operation history stored in the history storage section, a shut-off risk in a case of shutting off the battery shutoff switch while the key switch is on, and
• the controller provides control on the basis of a result of the determination so that the notification device issues a warning indicting the shut-off risk.