DRIVING ASSISTANCE DEVICE

A driving assistance device includes a steering operation member configured to receive a steering operation, a grip sensor provided in the steering operation member and configured to detect a grip position of a driver, and a controller configured to execute driving assistance control of a vehicle. The controller is configured to store grip tendency data related to a tendency of the grip position of the driver in execution of the driving assistance control, determine whether the driver is gripping the steering operation member with a dominant hand based on the grip tendency data and a detection result of the grip sensor, and make contents of the driving assistance control different depending on whether determining that the driver is gripping the steering operation member with the dominant hand or determining that the driver is not gripping the steering operation member with the dominant hand.