A periphery monitoring device includes: an image generation unit configured to generate a display image in which a gaze point in a virtual space is viewed from a virtual viewpoint, the virtual space being based on a model image formed by projecting a captured image obtained by imagining a periphery of a vehicle with an imaging unit mounted in the vehicle onto a model representing a three-dimensional virtual plane configured around the vehicle; and an image output unit configured to output the display image to a display unit, in which the image generation unit moves at least one of the virtual viewpoint and the gaze point in a direction including a component in a vehicle width direction of the vehicle according to an operation of a steering unit for changing a steering angle of the vehicle.

An electronic pulse driver includes a motor, a hammer, an anvil, an end tool mounting unit, a power supply unit, and a control unit. The hammer is rotatable together with the anvil. The end tool mounting unit transmits the rotation of the anvil to an end tool. The power supply unit supplies a drive electric power to the motor. The control unit controls the power supply unit to halt a supply of the drive electric power to the motor when an electric current flowing to the motor increases to a prescribed value. The control unit controls the power supply unit to supply to the motor a prestart electric power lower than the drive electric power before supplying the drive electric power in order to permit the power supply unit to supply the drive electric power after the hammer is in contact with the anvil.