The purpose of the invention is to enable a driver to intuitively and simply perform an operation for instructing a vehicle to overtake. In a driving assistance device (10), an image output unit (14)outputs, to a display unit (31), an image including a host vehicle object indicating the host vehicle, and another vehicle object which is in front of the host vehicle object, and which indicates another vehicle. An operation signal input unit (14) receives a user operation which changes the positional relationship between the host vehicle object and the other vehicle object in the image displayedon the display unit (31). When the positional relationship between the host vehicle object and the other vehicle object is changed such that the host vehicle object is positioned in front of the other vehicle object, a command output unit (14) outputs, to an automatic driving control unit (20) for controlling automatic driving, a command instructing that the host vehicle overtake the other vehicle.