Driving assistance device

A driving assistance device comprising:

• an in-vehicle sensor configured to acquire information regarding the behavior of an own vehicle and information regarding the behavior of a preceding vehicle traveling immediately ahead of the own vehicle;
• a processor configured to execute a process of controlling the own vehicle to travel at a predetermined upper limit speed and a process of controlling the own vehicle to follow the preceding vehicle, and further configured to detect that the preceding vehicle has started moving from a stopped state in which both the own vehicle and the preceding vehicle are stationary, and when it is detected that a driver of the own vehicle has performed a predetermined operation, to execute a process of controlling the own vehicle to start moving in accordance with the preceding vehicle;
• an operation device that is shared for an operation requesting an increase in the upper limit speed and an operation requesting the own vehicle to start moving;
• and
• a notification device, wherein
• the processor is configured to execute a notification process that controls the notification device such that information indicating that the upper limit speed has increased is provided to the driver when the upper limit speed at the time when the traffic congestion has been resolved is higher than the upper limit speed before the traffic congestion occurred.