To prevent the occurrence of troubles, thereby enhancing the efficiency of inspection work.

A failure prediction device for predicting failure includes a torque detector that detects a torque of a driving motor incorporated in the device, a monitor that monitors fluctuation in the torque detected by the torque detector, and a control unit that, when the torque monitored by the monitor is out of a range of set reference values, carries out any one or more of the following processing: stopping the driving motor, displaying an abnormal message, and issuing an alarm. A failure prediction method has the same configuration as a processing function of the failure prediction device. An inspection device includes the functions of the failure prediction device.