DRIVING ASSISTANCE DEVICE, DRIVING ASSISTANCE METHOD, AND NON-TRANSITORY COMPUTER READABLE MEDIUM STORING DRIVING ASSISTANCE PROGRAM

A driving assistance device is configured to assist driving of a vehicle having an autonomous driving function. A traffic status acquisition unit is configured to acquire a traffic status in a section between a present location of the vehicle, which drives in automatic operation in an automatic operation feasible section, and an end point of the automatic operation feasible section. The automatic operation feasible section is set as a limited domain in advance on map information. A timing determination unit is configured to alter change request timing, at which a change request is made to request a driver to make a driving change from the autonomous driving function to the driver, according to the traffic status acquired by the traffic status acquisition unit.