Driving assistance device

A driving assistance device comprising:

• a first driving assistance controller that executes first driving assistance control of automatic lane change control so as to perform lane changing automatically when a driver's intention to change lanes has been detected;
• a second driving assistance controller that executes second driving assistance control of different driving assistance control from the automatic lane change control;
• and
• a deactivation controller that controls so as to deactivate the automatic lane change control and the second driving assistance control,
• wherein the deactivation controller:
• deactivates the automatic lane change control when a control amount by the driver of a steering wheel, a brake pedal, or an accelerator pedal has exceeded a first deactivation threshold value during automatic lane change control;
• deactivates the second driving assistance control when the control amount has exceeded a second deactivation threshold value during the second driving assistance control;
• sets the first deactivation threshold value and the second deactivation threshold value so as to differ from each other;
• and
• adjusts the first deactivation threshold value to a lower value as a vehicle speed becomes higher.