DRIVING ASSISTANCE DEVICE

A driving assistance device for assisting driving of a driver of a vehicle includes: an in-vehicle light device for illuminating an inner surface of an interior of the vehicle; and a control device for controlling the in-vehicle light device. The control device includes: a condition determination unit for determining whether or not a forward facing condition in which the driver should face forward is satisfied; and a light control unit for controlling the in-vehicle light device so that light moves on an inner surface of the vehicle toward a position ahead of the driver when it is determined that the forward facing condition is satisfied.