A driving assistance device includes: a stoppage factor determination unit configured to determine whether to clear a stoppage factor of the own vehicle,; an interfering object determination unit configured to determine whether an interfering object is present that interferes with the starting of the own vehicle, based on object information of another object that has not been recognized as the stoppage factor; and a notification determination unit configured to: set, as a condition for permitting the provision of a notification for prompting the starting of the own vehicle being stopped, a determination that the stoppage factor is cleared made by the stoppage factor determination unit, and suppress the provision of the notification in response to the interfering object determination unit determining that the interfering object is present even if the stoppage factor determination unit determines that the stoppage factor is cleared during stoppage of the own vehicle.